Hi,
You cannot upgrade Ubuntu and keep your current Zentyal 5.1 version. Keep in mind that Zentyal needs a specific version of Ubuntu to work, for instance:
- Zentyal 6.x → Ubuntu 18.04
- Zentyal 7.x → Ubuntu 20.04
So, if you want to upgrade Ubuntu, you must use the script ‘/usr/share/zentyal/release-upgrade’ provided by Zentyal.
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