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I used virsh commands to backup a Xubuntu 22.04 VM on an Ubuntu 20.04 machine and restore it on an Ubuntu 18.04 machine.

The VM starts up successfully, but after a few minutes of running apt updates it hangs up in "Paused" state and after a forced shutdown will restart and "Pause" immediately.

Initially, I could not get it to start at all due to:

 unsupported machine type 'pc-q35-4.2'

I was able to fix that with virsh edit, changing this line ...

 <os>
   <type arch='x86_64' machine='pc-q35-4.2'>hvm</type>
 </os>

... to this ...

 <os>
   <type arch='x86_64' machine='q35'>hvm</type>
 </os>

It is very likely to be a versions problem. The original host (20.04) has:

 QEMU emulator version 4.2.1 (Debian 1:4.2-3ubuntu6.23)

The new host (18.04) has:

 QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.40)

Questions

  1. could there be a different reason for the failure?
  2. is it possible to upgrade QEMU 2.11.1 to QEMU 4.2.1 on an Ubuntu 18.04 machine?
  3. is it possible to upgrade Virtual Manager from 1.5.1 to 2.2.1 on an Ubuntu 18.04 machine?
  4. what else would I need to upgrade?
Martin Bramwell
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  • it might be possible but it's a dead end and not a supported case on serverfault.com due it should demonstrate reasonable information technology management practices in a business environment. – djdomi Aug 03 '22 at 17:21
  • @djdomi If this is the wrong forum, please tell me the correct one. – Martin Bramwell Aug 03 '22 at 17:47
  • you can try on superuser.com but I ain't sure if that's the same situation – djdomi Aug 03 '22 at 18:00

0 Answers0