Update to UCS 4.4-5 fails with Verification error: Invalid signature: gpgv: keyblock resource '/etc/apt/trusted.gpg': File or directory not found

[damrose]

If the update to UCS 4.4-5 aborts, the file /var/log/univention/updater.log should be checked for the following error:

**** Downloading scripts at Thu Jun 25 11:34:04 2020
Error: Update aborted due to verification error:
Verification error:
 Invalid signature: gpgv: keyblock resource '/etc/apt/trusted.gpg':
  File or directory not found                                     

If the error appears in the logfile, all available errata updates should be installed, before starting the release update to UCS 4.4-5.

This issue will affect all UCS 4.4-4 systems that have a errata level between 605 and 641. Once the server version is UCS 4.4-4 errata 642 and above, a release update to UCS 4.4-5 is possible. The current errata level can be determined by running univention-app info or in UMC by opening the side menu and clicking on Help → About UMC.

See Bug 51576 for more information

See also

UCS 4.x apt key expired, no package installation,update, app installation is possible

Please check the article for updates, an overview can be found below. 2021-06-28 15:00 CEST original article 2021-06-28 19:00 CEST fix for UCS versions >= 4.4-4 errata 605, manual workaround for older systems required, see below. 2021-06-28 15:00 The apt key shipped with UCS 4 has expired. On UCS 4.x no package installations and updates are currently possible, as well as UCS Release updates and App installations. On an affected UCS system the problem can be seen when e.g. updating the apt pa…