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PVE upgrade 6.4 > 7 network completely down

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I am in the middle of upgrading PVE to 7.0 and - while still on 6.4. - I have no more network connection after a reboot.
The primary network device is down (and therefore also the vm bridges) and it is impossible to activate it manually with ifup

1632257083766.png

ifup fails too

1632257208237.png

I am trying to fix this with a separate console connection from Hetzner ("KVM-Konsole"), but I have no idea what to do now.

Any ideas from the community?

Thanks, Thommie

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