Error UCS@school app within update check 5.0-2

UCS - Univention Corporate Server
#1

Hello, the update check to version 5.0-2 on my UCS-System 4.4-9 errata 1324 (UCS Core Edition) runs into the following error:

Blockquote
root@kopano:~# apt-key verify pre-update-checks-5.0-2{.gpg,} && bash pre-update-checks-5.0-2
gpgv: Signature made Do 30 Jun 2022 16:16:52 CEST
gpgv: using RSA key D293E501A055F562
gpgv: Good signature from “Univention Corporate Server 5.x packages@univention.de”

Starting pre-update-checks-5.0-2 (Fr 21. Okt 16:10:26 CEST 2022):
Checking disk_space … OK
Checking failed_ldif … OK
Checking hold_packages … OK
Checking ldap_connection … OK
Checking ldap_schema … OK
Checking master_version … OK
Checking minimum_ucs_version_of_all_systems_in_domain … OK
Checking overwritten_umc_templates … OK
Checking package_status … OK
Checking required_ucsschool_version … FAIL
Checking role_package_removed … OK
Checking slapd_on_member … OK
Checking system_date_too_old … OK
Checking valid_machine_credentials … OK

The system can not be updated to UCS 5.0 due to the following reasons:

required_ucsschool_version:
UCS@school is installed. To upgrade to UCS 5.0-2 as least UCS@school 5.0 v2 is required.
Please upgrade the UCS@school app first!

Blockquote

The message is strange because the UCS@school app isn’t installed on my system.
Any ideas what went wrong or what to do?
Thx a lot …

#2

Hello, in the meantime I found some more details about this error in the updater.log:

Checking required_ucsschool_version ...           Traceback (most recent call last):
  File "<string>", line 4, in <module>
ImportError: No module named 'univention.appcenter'
FAIL

Does anybody have an idea what went wrong?
Thx…

#3

This error has been reported here.

A fix is expected to be published.

#4

Is there a fix for the problem?
We have the same problem with an update from 4.4.9 to 5.0.3. Updates stopped after 5.0.1 with the error:

UCS@school is installed. To upgrade to UCS 5.0-2 as least UCS@school 5.0 v2 is required.
Please upgrade the UCS@school app first!

But UCS@school is not installed on the Server!

There is nothing published in Bug 55568 to solve the Problem

How can the Update to 5.0.3 be done?

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