Hi
Strangest thing, on this same computer ... during this mornings full-upgrade I got a kernel panic. I had to do a cold boot to recover, and, during dpkg --reconfigure -a, I got another kernel panic. I'm not sure, but I think it was trying to rebuild intramfs when it happened. dpkg --reconfigure -a after the second panic came up with nothing. Upon reboot, the new 5.15.4 kernel booted just fine and there doesn't seem to be any residual problems from the kernel panic.
DU's on the new machine and the old lxqt laptop went without incident.
BTW - Thunderbird just released it's 5.15 kernel, and, it blew up on this machine also. Instead of just dropping me to busybox, it just left me with some colored artifacts.