Problem: Pre-Update-Checks fail because of incompatible extensions

If you get an error from the pre-update-checks-x.x-x command like this one the following steps might help:

The following extensions are incompatible with UCS 5.0:
        cn=63openvpn-sitetosite,cn=ldapacl,cn=univention,dc=ibb-tga,dc=local: [unspecified..unspecified)

Step 1: Verify if some packages are outdated and have been replaced. In this example the openvpn4ucs package replaces old packages. First you should remove the old packages (if any):

apt remove python-univention-openvpn-common univention-openvpn-master univention-openvpn-schema univention-openvpn-server openvpn

Step 2: Execute the following command to delete the extensions of the old package:

source /usr/share/univention-lib/ && ucs_unregisterLDAPExtension --acl 63openvpn-sitetosite

After these steps, the update check should proceed without issues.

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