I tried to upgrade to 4.3 and it failed in one step and rebooted. Now I cannot continue because the upgrade script failed and I even cannot open the qubes menu.
I want to revert to the snapshot created at the very beginning of the upgrade. How to do that?
The usual manual
doesn’t help, because it only shows how to revert to a previous state, not how to revert to a snapshot.
What are the steps to revert to the Qubes42UpgradeBackup snapshot?