Because of quirks of this particular system, reinstalling takes two days so I'd rather find other avenues to pursue.

I chose Debian as my default template. . . I know this is less well supported, but I'd prefer to keep it this way because "reasons".

That's neither here nor there though. After setting up the Wifi drivers in the debian-11 template, that template and VMs based off of it will no longer start. The system complains

Cannot connect to qrexec agent for 60 seconds, see /var/log/xen/console/guest-<vm name>.log for details

Unfortunately, there's NO details in the referenced log files at all. . . nothing new is written into them. The last lines are just what was written there the last time the VM ran correctly (2:34 PM this afternoon).

Googling and reading, I haven't been able to suss out how to troubleshoot a VM in these circumstances. Is there a way to either access the VMs syslog when it's powered off or see / log the VMs console output while it's booting? It's gotta be spitting out something, before it just dies, but that stuff might as well get piped to /dev/null for all I can tell.

Any other suggestions? Thanks very much.

Note: As I have no network, I'm not sure how to just reinstall the template. . . (I didn't make a backup because I'm a dumb idiot). Is there a way to do this using a usb drive? Or the install media?