Its happen to me also .
you should restart the computer and try again .
if not copy the appvm .
Roy
boom, was just aobut to suggest this. its the beauty of qubes. do it for any anomaly. when in doubt delete it and recreate it in seconds. its the most suspect vm of them all.
It may be a coincidence, but when it happened to me I got sys-net running by shutting down sys-whonix first. I've since disabled sys-whonix and haven't had the issue again, although I haven't been rebooting much since.
- Reynir
I can recreate this error message consistently while running the latest R4 rc3.
Inside of sys-net, just shut down the vm from the inside (e.g. sudo reboot)
Afterwards sys-net fails to start:
$ qvm-start sys-net
Start failed: invalid argument: network device with mac XX:XX:XX:XX:XX:XX already exists
To get back in a good state without rebooting the entire machine, I have to shut down (or kill) all dependent vms (AppVMs talking to my firewall-vm and my firewall vm). Then I can start sys-net again, followed by my firewall vm, followed by my regular app vms.
I've managed to trigger this on two Lenovo laptops and one Dell laptop so far, all of which are running R4rc3.
I'm pretty new to QubesOS and haven't figured out how to dig through the innards well enough yet to find anything useful.
afaik, You can't shut down sys-net if other vms using it are running.
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Yes if you have some programs and data open to continue working on them.
Otherwise if rather just shutting down the vms, There is a script someone made in the community to shut down all vms with one command. Its on forums somewhere.