Problem
I removed the ntp (network time protocol) package from my UCS server by accident and now most of the Univention packages appear as “rc” in apt and will be remove the next run.
This will cause the UCS server to be out of service very soon.
Environment
As time synchronization is very important for any Kerberos based authentication system the ntp package is vital for UCS to work properly. Take care not to remove the package at all!
root@ucs:~# dpkg -l
[...]
rc univention-config-registry 12.0.1-5A~4.2.0.201703151910 all UCS transitional package - base configuration
rc univention-samba 10.0.3-6.524.201705221910 all UCS - Samba domain controller
rc univention-system-setup-boot 9.0.7-4.1015.201702221607 all Starting univention-system-setup on next boot
[...]
Solution
You might be able to recover from this scenario by re-installing the “rc” marked packages with the “apt-get” command:
apt-get install --reinstall univention-samba
and repeat the above step for every package marked “rc”.
The safe way is to re-install your UCS server as due to now missing dependencies the next update may fail.