Major OS error, all VMs unusable, network manager disappeared

Run this in dom0:

journalctl -f

and try to start an AppVM. What does it say?

Also post here the logs available from the Qube Manager for this AppVM.

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A post was split to a new topic: Only dom0 is running after logging in

It was in fact, Heads.

I had to update Heads to a newer build. It solved the 4.1 compatibility issues.