Dom0 update failed on v4.1.2 R4.1

Solved it.

The reason why no update on dom0 was possible is too low memory in the update qube.

On my system the update qube is sys-firewall. I could’n increase the memory from sys-firewall because the option in qube settings was greyed out.
sys-firewall depends on a template debian-11-dvm which is a template for disposables, this in turn depends on the basic debian-11 template.
At this basic underlying template it was possible to increase the system storage max size by a few gigabytes.
This did the job, the installation of dom0 update worked.

Thanks at all for replies.

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