Infinite loop on GET nmap-common during update from 4.4-9 to 5.0-2

Hello everybody
after release of kopano compatible with UCS5, I tried update. first packages updated, then kopano core & webapp.
after initiating update to UCS V5 and system and waiting for several minutes, this was the log (last line loops indefinity)

Starting univention-upgrade. Current UCS version is 4.4-9 errata1277

Checking for local repository:                          none
Checking for package updates:                           found

The following packages will be REMOVED:
 libtirpc1,php7.0-curl,libcurl3,libmariadbclient18,libllvm3.8,libsensors4,libllvm3.9,gnupg1-curl,python-samba,python-ldb,python-tdb,libapache2-mod-wsgi,univention-management-console-module-mrtg,emacs24-bin-common,emacs24-common,mariadb-server-10.1,mariadb-client-10.1,mariadb-client-core-10.1,mariadb-server-core-10.1,univention-virtual-machine-manager-schema,python-univention-directory-manager-uvmm,univention-ftp,univention-kernel-image,univention-mysql,univention-runit
The following packages will be installed:
[u][I deleted the long list to keep topic small][/u]
Starting dist-update at Mon Aug  1 13:42:38 2022...
Starting package upgrade                                Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
The following packages were automatically installed and are no longer required:
  apt-transport-https cpp-6 firmware-atheros firmware-bnx2 firmware-bnx2x
  firmware-brcm80211 firmware-cavium firmware-intelwimax firmware-iwlwifi
  firmware-libertas firmware-myricom firmware-netxen firmware-qlogic
  firmware-realtek firmware-ti-connectivity gcc-6 gcc-7-base
  golang-docker-credential-helpers libapparmor-perl libasan3 libcilkrts5
  libegl1-mesa libevent-2.0-5 libgcc-6-dev libglew2.0 libglew2.1 libglu1-mesa
  libhiredis0.14 libical2 libisl15 libjemalloc1 liblvm2app2.2 liblvm2cmd2.02
  libmemcachedutil2 libmpfr4 libpcre16-3 libperl5.24 libpoppler64 libpython3.5
  libqt5opengl5 libqt5sql5 libqt5sql5-sqlite libsecret-1-0 libsecret-common
  libubsan0 libwayland-egl1-mesa libxerces-c3.1 libxml-security-c17v5
  mesa-utils mrtg php-mcrypt php7.0-mcrypt proftpd-basic proftpd-doc
  proftpd-mod-ldap python-decorator python-ruamel.ordereddict
  python-setproctitle python-smbpasswd python-support python-tzlocal
  python-univention-app-appliance python-yaml python3-dockerpycreds runit
  runit-systemd sysuser-helper sysvinit univention-ifplugd univention-skel
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
  emacs24-bin-common emacs24-common gnupg1-curl libapache2-mod-wsgi libcurl3
  libllvm3.8 libllvm3.9 libmariadbclient18 libsensors4 libtirpc1
  mariadb-client-10.1 mariadb-client-core-10.1 mariadb-server-10.1
  mariadb-server-core-10.1 php7.0-curl python-ldb python-samba python-tdb
  python-univention-directory-manager-uvmm univention-ftp
  univention-kernel-image univention-management-console-module-mrtg
  univention-mysql univention-runit univention-virtual-machine-manager-schema
The following NEW packages will be installed:
  avahi-daemon binutils-common binutils-x86-64-linux-gnu cifs-utils cpp-8
  dns-root-data e2fsprogs-l10n emacs-bin-common emacs-common emacs-el
  emacs-gtk fdisk fonts-open-sans gcc-7-base gcc-8 geoclue-2.0 gnupg-l10n
  gnupg-utils gpg gpg-agent gpg-wks-client gpg-wks-server gpgconf gpgsm
  guile-2.2-libs iio-sensor-proxy install-info libapache2-mod-php7.3
  libapache2-mod-wsgi-py3 libargon2-1 libasan5 libavahi-core7 libavahi-glib1
  libbind9-161 libbinutils libbrotli1 libcom-err2 libcrypt-openssl-random-perl
  libcryptsetup12 libcurl4 libdata-dump-perl libde265-0
  libdigest-bubblebabble-perl libdns-export1104 libdns1104 libdrm-common
  libefiboot1 libefivar1 libegl-mesa0 libegl1 libev4 libevent-2.1-6
  libevent-core-2.1-6 libevent-pthreads-2.1-6 libext2fs2 libfl2 libfstrm0
  libgcc-8-dev libgdbm-compat4 libgdbm6 libgdk-pixbuf2.0-bin libgfortran5
  libgl1 libglew2.1 libglvnd0 libglx-mesa0 libglx0 libgpg-error-l10n
  libgpgme11 libgsasl7 libheif1 libhiredis0.14 libhyphen0 libical3 libicu63
  libimagequant0 libirs161 libisc-export1100 libisc1100 libisccc161
  libisccfg163 libisl19 libjim0.77 libkyotocabinet16v5 libldb2 libllvm7
  liblvm2cmd2.03 liblwres161 libmagickcore-6.q16-6 libmagickwand-6.q16-6
  libmailutils5 libmariadb3 libmbim-glib4 libmbim-proxy libmm-glib0 libmpfr6
  libncurses6 libncursesw6 libnet-dns-sec-perl libnftables0 libnftnl11
  libnl-route-3-200 libnotify4 libnss-mdns libnss-systemd libntlm0
  libpcre2-16-0 libpcre2-8-0 libpcsclite1 libperl5.28 libpolkit-gobject-1-0
  libpoppler82 libprocps7 libprotobuf-c1 libpython2-stdlib libpython3.7
  libpython3.7-minimal libpython3.7-stdlib libqmi-glib5 libqmi-proxy
  libqrencode4 libqt5positioning5 libqt5sensors5 libqt5webchannel5
  libsensors-config libsensors5 libsodium23 libtinfo6 libtirpc-common
  libtirpc3 libtry-tiny-perl libubsan1 libuchardet0 libunbound8 libunistring2
  libutempter0 libwayland-egl1 libwebpmux3 libwoff1 libx265-165 libzstd1
  linux-image-4.19.0-16-amd64 linux-image-amd64 mailutils mailutils-common
  mariadb-client-10.3 mariadb-client-core-10.3 mariadb-server
  mariadb-server-10.3 mariadb-server-core-10.3 modemmanager nftables
  nmap-common notification-daemon perl-modules-5.28 php-cli php7.3 php7.3-cgi
  php7.3-cli php7.3-common php7.3-curl php7.3-gd php7.3-json php7.3-ldap
  php7.3-mbstring php7.3-opcache php7.3-phpdbg php7.3-readline php7.3-xml
  php7.3-zip pigz plymouth-label postgresql-client-11 proftpd-doc
  python-asn1crypto python-backports.tempfile python-backports.weakref
  python-certifi python-configparser python-cookies python-funcsigs
  python-future python-mock python-nacl python-olefile python-packaging
  python-passlib python-pbr python-pyparsing python-responses
  python-simplejson python2 python2-minimal python3-alabaster python3-apt
  python3-asn1crypto python3-babel python3-bcrypt python3-certifi
  python3-cherrypy3 python3-click python3-colorama python3-cookies
  python3-cracklib python3-crypto python3-daemon python3-debian
  python3-distutils python3-dns python3-dnspython python3-docutils
  python3-future python3-genshi python3-gpg python3-imagesize python3-jinja2
  python3-lazy-object-proxy python3-ldap python3-ldb python3-lib2to3
  python3-lockfile python3-m2crypto python3-mako python3-markupsafe
  python3-memcache python3-mimeparse python3-mysqldb python3-nacl
  python3-netifaces python3-olefile python3-packaging python3-pam
  python3-paramiko python3-passlib python3-paste python3-pexpect python3-pil
  python3-ply python3-polib python3-psutil python3-ptyprocess
  python3-pyasn1-modules python3-pycurl python3-pygments python3-pygresql
  python3-pyparsing python3-pysaml2 python3-renderpm python3-reportlab
  python3-reportlab-accel python3-repoze.lru python3-repoze.who
  python3-responses python3-roman python3-routes python3-ruamel.yaml
  python3-samba python3-simplejson python3-sphinx python3-talloc python3-tdb
  python3-tempita python3-tornado python3-trml2pdf python3-unidecode
  python3-univention python3-univention-admin-diary
  python3-univention-app-appliance python3-univention-appcenter
  python3-univention-appcenter-docker python3-univention-config-registry
  python3-univention-debhelper python3-univention-debug
  python3-univention-directory-manager
  python3-univention-directory-manager-cli
  python3-univention-directory-manager-rest
  python3-univention-directory-reports python3-univention-heimdal
  python3-univention-lib python3-univention-license
  python3-univention-management-console python3-univention-pkgdb
  python3-univention-portal python3-univention-updater python3-uritemplate
  python3-webob python3-zope.interface python3.7 python3.7-minimal qrencode
  runit-helper runit-systemd samba-dsdb-modules sntp sysuser-helper
  thin-provisioning-tools univention-management-console-module-welcome
  usb-modeswitch usb-modeswitch-data usb.ids wpasupplicant
The following packages will be upgraded:
  acl adduser adwaita-icon-theme altermime amavisd-new amd64-microcode apache2
  apache2-bin apache2-data apache2-suexec-pristine apache2-utils apparmor apt
  apt-transport-https apt-utils aspell aspell-en at base-files base-passwd
  bash bash-completion bc bind9 bind9-host bind9utils binutils bridge-utils
  bsd-mailx bsdmainutils bsdutils busybox bzip2 ca-certificates catdoc
  cgroupfs-mount console-data console-setup console-setup-linux containerd
  coreutils cpio cpp cracklib-runtime cron curl cy2-saml dash db-util
  db5.3-util dbus dbus-x11 dconf-gsettings-backend dconf-service debconf
  debconf-i18n debian-archive-keyring debianutils dh-python
  dictionaries-common diffutils dirmngr discover distro-info-data dmeventd
  dmidecode dmsetup dnsutils docker-compose docker.io docutils-common dpkg
  dpt-i2o-raidutils e2fslibs e2fsprogs elinks elinks-data emacs24
  emacsen-common fetchmail file findutils firmware-amd-graphics
  firmware-atheros firmware-bnx2 firmware-bnx2x firmware-brcm80211
  firmware-cavium firmware-intelwimax firmware-iwlwifi firmware-libertas
  firmware-linux firmware-linux-nonfree firmware-misc-nonfree firmware-myricom
  firmware-netxen firmware-qlogic firmware-realtek firmware-ti-connectivity
  fontconfig fontconfig-config fuse galera-3 gawk gcc gcc-8-base gconf-service
  gconf2-common gettext-base ghostscript glib-networking
  glib-networking-common glib-networking-services gnupg gnupg-agent gnupg1
  gnupg1-l10n gnutls-bin golang-docker-credential-helpers gpgv grep groff-base
  grub-common grub-pc grub-pc-bin grub2-common gsettings-desktop-schemas
  gsfonts gstreamer1.0-plugins-base gtk-update-icon-cache gzip haveged
  heimdal-clients heimdal-kdc heimdal-servers hicolor-icon-theme hostname
  ifupdown imagemagick-6-common init init-system-helpers initramfs-tools
  initramfs-tools-core installation-report iproute2 iptables iputils-ping
  irqbalance isc-dhcp-client isc-dhcp-common iso-codes iucode-tool kbd
  keyboard-configuration keyutils klibc-utils kmod kopano-backup kopano-client
  kopano-common kopano-dagent kopano-dagent-pytils kopano-gateway kopano-ical
  kopano-lang kopano-monitor kopano-python-utils kopano-search kopano-server
  kopano-server-packages kopano-spooler laptop-detect ldap-utils less libacl1
  libaio1 libapache2-mod-authnz-pam libapparmor-perl libapparmor1 libapr1
  libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap libapt-inst2.0
  libapt-pkg5.0 libarchive-zip-perl libarchive13 libasn1-8-heimdal libasound2
  libasound2-data libaspell15 libassuan0 libatk-bridge2.0-0 libatk1.0-0
  libatk1.0-data libatomic1 libatspi2.0-0 libattr1 libaudit-common libaudit1
  libavahi-client3 libavahi-common-data libavahi-common3 libberkeleydb-perl
  libblas3 libblkid1 libbsd0 libbytes-random-secure-perl libbz2-1.0 libc-bin
  libc-dev-bin libc-l10n libc6 libc6-dev libcairo-gobject2 libcairo2
  libcap-ng0 libcap2 libcap2-bin libcc1-0 libcdparanoia0 libcgi-fast-perl
  libcgi-pm-perl libcilkrts5 libcolord2 libcomerr2 libconfig-inifiles-perl
  libconvert-uulib-perl libcrack2 libcroco3 libcrypt-openssl-bignum-perl
  libcrypt-openssl-rsa-perl libcrypt-passwdmd5-perl libcrystalhd3 libcups2
  libcupsfilters1 libcupsimage2 libcurl3-gnutls libdaemon0 libdatrie1 libdb5.3
  libdbd-mysql-perl libdbi-perl libdbi1 libdbus-1-3 libdbus-glib-1-2 libdconf1
  libdebconfclient0 libdevmapper-event1.02.1 libdevmapper1.02.1
  libdigest-hmac-perl libdiscover2 libdouble-conversion1 libdrm-amdgpu1
  libdrm-intel1 libdrm-nouveau2 libdrm-radeon1 libdrm2 libdumbnet1 libedit2
  libegl1-mesa libelf1 libepoxy0 liberror-perl libestr0 libevdev2 libexif12
  libexpat1 libfastjson4 libfcgi-perl libfdisk1 libffi6 libfftw3-double3
  libfile-copy-recursive-perl libfontconfig1 libfreetype6 libfribidi0 libfuse2
  libgbm1 libgc1c2 libgcc1 libgconf-2-4 libgcrypt20 libgd3 libgdk-pixbuf2.0-0
  libgdk-pixbuf2.0-common libgeoip1 libgif7 libgl1-mesa-dri libgl1-mesa-glx
  libglapi-mesa libglib2.0-0 libglu1-mesa libgmp10 libgnutls-dane0 libgnutls30
  libgomp1 libgpg-error0 libgpm2 libgraphite2-3 libgs9 libgs9-common libgsm1
  libgsoap-kopano-2.8.109 libgssapi-krb5-2 libgssapi3-heimdal
  libgstreamer-plugins-base1.0-0 libgstreamer1.0-0 libgtk-3-0 libgtk-3-common
  libgudev-1.0-0 libharfbuzz0b libhavege1 libhcrypto4-heimdal libhdb9-heimdal
  libheimbase1-heimdal libheimntlm0-heimdal libhogweed4 libhtml-parser-perl
  libhtml-template-perl libhtml-tree-perl libhttp-cookies-perl
  libhttp-daemon-perl libhttp-message-perl libhttp-negotiate-perl libhx28
  libhx509-5-heimdal libidn11 libidn2-0 libijs-0.35 libinput-bin libinput10
  libio-socket-ssl-perl libio-stringy-perl libip4tc0 libip6tc0 libiptc0
  libiptcdata0 libitm1 libjansson4 libjbig2dec0 libjpeg62-turbo libjs-jquery
  libjs-sphinxdoc libjs-underscore libjson-c3 libjson-glib-1.0-0
  libjson-glib-1.0-common libk5crypto3 libkadm5clnt7-heimdal
  libkadm5srv8-heimdal libkafs0-heimdal libkcarchiver0 libkcarchivercore0
  libkcfreebusy0 libkcicalmapi0 libkcinetmapi0 libkcoidc0 libkcpyplug0
  libkcrosie0 libkcserver0 libkcsoap0 libkcutil0 libkdc2-heimdal libkeyutils1
  libklibc libkmod2 libkrb5-26-heimdal libkrb5-3 libkrb5support0 liblasso3
  liblcms2-2 libldap-2.4-2 libldap-common libldb1 liblinear3
  liblocale-gettext-perl liblockfile-bin liblockfile1 liblognorm5 liblqr-1-0
  liblsan0 libltdl7 liblua5.3-0 liblwp-protocol-https-perl liblz4-1 liblzma5
  liblzo2-2 libm17n-0 libmagic-mgc libmagic1 libmail-dkim-perl libmapi1
  libmath-random-isaac-perl libmcrypt4 libmemcached11 libmemcachedutil2
  libmime-tools-perl libmount1 libmp3lame0 libmpc3 libmpdec2 libmpx2
  libmspack0 libncurses5 libncursesw5 libnet-cidr-perl libnet-dns-perl
  libnet-http-perl libnet-ip-perl libnet-libidn-perl libnet-server-perl
  libnet-snmp-perl libnet-ssleay-perl libnetaddr-ip-perl
  libnetfilter-conntrack3 libnettle6 libnewt0.52 libnfnetlink0 libnghttp2-14
  libnl-3-200 libnl-genl-3-200 libnpth0 libnspr4 libnss-extrausers libnss-ldap
  libnss3 libnuma1 libodbc1 libogg0 libopenjp2-7 libopts25 libopus0
  liborc-0.4-0 libotf0 libotp0-heimdal libp11-kit0 libpam-cap libpam-cracklib
  libpam-heimdal libpam-modules libpam-modules-bin libpam-runtime
  libpam-systemd libpam-univentionmailcyrus libpam0g libpango-1.0-0
  libpangocairo-1.0-0 libpangoft2-1.0-0 libpaper-utils libpaper1 libpcap0.8
  libpciaccess0 libpcre16-3 libpcre3 libpipeline1 libpixman-1-0 libplymouth4
  libpng16-16 libpopt0 libpq5 libproxy1v5 libpsl5 libpython-stdlib
  libpython2.7 libpython2.7-minimal libpython2.7-stdlib libpython3-stdlib
  libqt5core5a libqt5dbus5 libqt5gui5 libqt5network5 libqt5opengl5
  libqt5printsupport5 libqt5qml5 libqt5quick5 libqt5sql5 libqt5sql5-sqlite
  libqt5svg5 libqt5webkit5 libqt5widgets5 libquadmath0 libreadline5
  libreadline7 librelp0 librest-0.7-0 libroken18-heimdal librsvg2-2
  librsvg2-common librtmp1 libs3-4 libsasl2-2 libsasl2-modules
  libsasl2-modules-db libsasl2-modules-gssapi-heimdal libseccomp2
  libsecret-1-0 libsecret-common libselinux1 libsemanage-common libsemanage1
  libsepol1 libshine3 libsigsegv2 libsl0-heimdal libslang2 libsm6
  libsmartcols1 libsmbclient libsnappy1v5 libsnmp-base libsnmp-session-perl
  libsnmp30 libsocket6-perl libsoup-gnome2.4-1 libsoup2.4-1 libsoxr0
  libsqlite3-0 libss2 libssh2-1 libssl1.1 libstdc++6 libsystemd0 libtalloc2
  libtasn1-6 libtcmalloc-minimal4 libtdb1 libterm-readkey-perl libtevent0
  libtext-iconv-perl libthai-data libthai0 libtheora0 libtiff5
  libtimedate-perl libtinfo5 libtsan0 libtwolame0 libubsan0 libudev1
  libunivention-config0 libunivention-debug1 libunivention-license0
  libunivention-policy0 libunix-syslog-perl liburi-perl libusb-0.1-4
  libusb-1.0-0 libuuid1 libvdpau1 libvisual-0.4-0 libvorbis0a libvorbisenc2
  libwacom-common libwacom2 libwavpack1 libwayland-client0 libwayland-cursor0
  libwayland-egl1-mesa libwayland-server0 libwbclient0 libwebp6 libwebpdemux2
  libwind0-heimdal libwrap0 libwww-perl libwww-robotrules-perl libx11-6
  libx11-data libx11-xcb1 libxapian30 libxau6 libxcb-dri2-0 libxcb-dri3-0
  libxcb-glx0 libxcb-icccm4 libxcb-present0 libxcb-randr0 libxcb-render-util0
  libxcb-render0 libxcb-shape0 libxcb-shm0 libxcb-sync1 libxcb-xfixes0
  libxcb-xinerama0 libxcb-xkb1 libxcb1 libxcursor1 libxdamage1 libxft2
  libxinerama1 libxkbcommon-x11-0 libxkbcommon0 libxkbfile1 libxml-parser-perl
  libxml-perl libxml2 libxmlsec1 libxmlsec1-openssl libxmu6 libxmuu1
  libxshmfence1 libxslt1.1 libxt6 libxtables12 libxvidcore4 libyaml-0-2
  libzip4 libzvbi-common libzvbi0 linux-base locales locate lockfile-progs
  login logrotate lsb-base lsb-release lsof lvm2 m17n-db make makepasswd
  man-db manpages manpages-dev mariadb-common memcached memtest86+ mesa-utils
  mime-support monitoring-plugins monitoring-plugins-basic
  monitoring-plugins-common monitoring-plugins-standard mount mrtg
  multiarch-support mysql-common nagios-nrpe-server nano ncurses-base
  ncurses-bin ncurses-term ndiff net-tools netbase netcat-openbsd
  netcat-traditional nfs-common nfs-kernel-server nmap nscd ntp ntpdate
  open-vm-tools openbsd-inetd openssh-client openssh-server
  openssh-sftp-server openssl os-prober pam-runasroot pam-saml pass passwd pax
  perl perl-base php php-cgi php-common php-curl php-gd php-krb5 php-ldap
  php-mbstring php-memcache php-pear php-xml php-zip php7-mapi pinentry-curses
  plymouth plymouth-themes poppler-data poppler-utils postfix postfix-ldap
  postfix-sqlite postgresql-client postgresql-client-common postgresql-common
  procps proftpd-basic proftpd-mod-ldap psmisc pwgen python python-apt
  python-apt-common python-babel python-babel-localedata python-backports-abc
  python-bcrypt python-cffi-backend python-chardet python-cherrypy3
  python-click python-concurrent.futures python-cracklib python-crypto
  python-cryptography python-daemon python-dateutil python-debian
  python-decorator python-defusedxml python-dns python-dnspython
  python-docutils python-enum34 python-formencode python-genshi python-idna
  python-imagesize python-ipaddr python-jinja2 python-lazy-object-proxy
  python-ldap python-lxml python-m2crypto python-magic python-mako
  python-markupsafe python-memcache python-mimeparse python-minimal
  python-mysqldb python-netifaces python-notifier python-openssl
  python-paramiko python-paste python-pexpect python-pil python-pkg-resources
  python-polib python-psutil python-psycopg2 python-ptyprocess python-pyasn1
  python-pyasn1-modules python-pycurl python-pygments python-pygresql
  python-pylibmc python-pysaml2 python-reportlab python-reportlab-accel
  python-repoze.lru python-requests python-roman python-routes
  python-ruamel.ordereddict python-ruamel.yaml python-setproctitle
  python-setuptools python-six python-smbpasswd python-sphinx python-tornado
  python-typing python-tz python-tzlocal python-unidecode python-univention
  python-univention-admin-diary python-univention-app-appliance
  python-univention-appcenter python-univention-appcenter-docker
  python-univention-config-registry python-univention-debhelper
  python-univention-debug python-univention-directory-manager
  python-univention-directory-manager-cli
  python-univention-directory-manager-rest python-univention-directory-reports
  python-univention-heimdal python-univention-ipcalc python-univention-lib
  python-univention-license python-univention-management-console
  python-univention-namespace python-univention-pkgdb
  python-univention-updater python-uritemplate python-urllib3 python-webob
  python-yaml python-zope.interface python2.7 python2.7-minimal python3
  python3-bsddb3 python3-cached-property python3-cffi-backend python3-chardet
  python3-cryptography python3-dateutil python3-defusedxml python3-docker
  python3-dockerpycreds python3-docopt python3-idna python3-jsonschema
  python3-kopano python3-kopano-search python3-kopano-utils python3-magic
  python3-mapi python3-minimal python3-notifier python3-openssl
  python3-pkg-resources python3-pyasn1 python3-requests python3-setuptools
  python3-six python3-socks python3-texttable python3-tz python3-urllib3
  python3-websocket python3-xapian python3-yaml qt5-gtk-platformtheme
  qttranslations5-l10n quota re2c readline-common rpcbind rsync rsyslog
  rsyslog-relp runc runit sa-compile samba-common samba-common-bin samba-libs
  sasl2-bin screen sed sensible-utils shared-mime-info shell-univention-lib
  simplesamlphp slapd smbclient snmp socat spamassassin spamc sphinx-common
  stunnel4 sudo sysstat systemd systemd-sysv sysvinit-utils tar tasksel
  tasksel-data tcpd tofrodos tree tzdata ucf udev
  univention-admin-diary-client univention-antivir-mail univention-apache
  univention-apache-vhost univention-app-appliance univention-appcenter
  univention-appcenter-docker univention-archive-key univention-base-files
  univention-base-packages univention-bind univention-bootsplash
  univention-config univention-directory-listener
  univention-directory-manager-rest univention-directory-manager-tools
  univention-directory-notifier univention-directory-policy
  univention-directory-reports univention-docker univention-errata-level
  univention-fetchmail univention-fetchmail-schema univention-firewall
  univention-grub univention-heimdal-common univention-heimdal-kdc
  univention-home-mounter univention-ifplugd univention-initrd
  univention-ipcalc univention-join univention-ldap-acl-master
  univention-ldap-client univention-ldap-config univention-ldap-config-master
  univention-ldap-overlay-memberof univention-ldap-server
  univention-license-import univention-mail-postfix univention-maintenance
  univention-maintenance-mode univention-management-console
  univention-management-console-frontend univention-management-console-login
  univention-management-console-module-appcenter
  univention-management-console-module-apps
  univention-management-console-module-diagnostic
  univention-management-console-module-ipchange
  univention-management-console-module-join
  univention-management-console-module-lib
  univention-management-console-module-passwordchange
  univention-management-console-module-quota
  univention-management-console-module-reboot
  univention-management-console-module-services
  univention-management-console-module-setup
  univention-management-console-module-sysinfo
  univention-management-console-module-top
  univention-management-console-module-ucr
  univention-management-console-module-udm
  univention-management-console-module-updater
  univention-management-console-server
  univention-management-console-web-server univention-mariadb
  univention-nagios-client univention-nagios-common univention-network-common
  univention-newsid univention-nfs-server univention-pam
  univention-pkgdb-tools univention-policy-tools univention-portal
  univention-postgresql univention-quota univention-role-common
  univention-role-server-common univention-saml univention-saml-schema
  univention-sasl univention-self-service univention-self-service-invitation
  univention-self-service-master univention-self-service-passwordreset-umc
  univention-server-master univention-server-overview univention-spamassassin
  univention-ssh univention-ssl univention-sudo univention-system-activation
  univention-system-info univention-system-setup univention-updater
  univention-web-js univention-web-style univention-welcome-screen unzip
  update-inetd usbutils util-linux vim vim-common vim-runtime vim-tiny vlan
  w3m wamerican wget whiptail whois wngerman x11-xkb-utils xapian-tools xauth
  xfsprogs xkb-data xml-core xmlsec1 xsltproc xxd xz-utils zlib1g zsync
The following packages will be DOWNGRADED:
  clamav clamav-base clamav-daemon clamav-freshclam clamdscan eject
  firefox-esr ifplugd intel-microcode libclamav9 libfile-listing-perl
  libfsplib0 libhtml-form-perl libhttp-date-perl liblwp-mediatypes-perl
  libnetpbm10 libtext-charwidth-perl libtext-wrapi18n-perl libtre5
  libxml-regexp-perl linux-libc-dev mawk netpbm python-pam
  python-singledispatch python-trml2pdf
1004 upgraded, 301 newly installed, 26 downgraded, 25 to remove and 0 not upgraded.
Need to get 264 MB/741 MB of archives.
After this operation, 835 MB of additional disk space will be used.
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]
Get:1 http://updates.software-univention.de ucs500/main amd64 nmap-common all 7.70+dfsg1-6+deb10u1 [3,898 kB]

updating this particular package (nmap) from UI/Software/Package Management tells that package is upgradable and initiate update of this particular package triggers same infinite loop
3898kB file is downloaded over & over without any error or failure.
package update through SHH is also the same.
would you please guide me what to do? I’m not an expert in Linux or UCS backend.
thanks.