Problem
On a freshly installed UCS 5.2 system, the public key for the OX repositories is missing, see Bug 58658. As a result, updates fail when the OX license management is correctly configured and the repositories are enabled.
Err:11 https://software.open-xchange.com/components/univention/stable/7.10.6/DebianBookworm ./ InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1234567890XYZ
This issue prevents the system from verifying packages from the OX repositories, causing installation and update failures.
Workaround
The missing build key can be imported manually using the following command:
wget -qO - https://software.open-xchange.com/0xABC1DEF2-oxbuildkey.pub \
| gpg --dearmor > /etc/apt/trusted.gpg.d/0xABC1DEF2-oxbuildkey.gpg
Replace 0xABC1DEF2 accordingly.