Recovered by booting into an older kernel and running
sudo update-initramfs -u -k 5.8.0-25-generic
sudo update-grub
There are still some initialization failures reported at boot but at
least the 20.10 boot is successful.
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https://bugs.launchpad.net/bugs/1901231
Title:
package linux-image-5.8.0-25-generic 5.8.0-25.26 failed to
install/upgrade: triggers looping,