Demi Obenour:
On my system, Xen cannot find the dom0 kernel.  The happened after a
kernel-latest upgrade, possibly due to a missing initramfs.

Is there a way to recover without live media?  Ideally, Xen would prompt
the user for a dom0 kernel entry, but it doesn’t.

Also, once I have recovered, how can I keep such problems from happening
again?

If booting UEFI (and it sounds like you are), see https://www.qubes-os.org/doc/uefi-troubleshooting/#accessing-installer-rescue-mode-on-uefi.

Sometimes this issue is caused by your EFI partition running out of free space. Were there any warning messages on the update? You might not even see them if you used the widget and didn't look at detail. If you need to clean up to make room, make sure to leave at least one known good set of files in EFI and set your xen.cfg to point to it.


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