I faced during sudo do-release-upgrade this situation:
Reading cache
pcilib: Cannot open /proc/bus/pci
lspci: Cannot find any working access method.
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://security.ubuntu.com/ubuntu groovy-security InRelease
Hit http://archive.ubuntu.com/ubuntu groovy InRelease
Hit http://archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit http://archive.ubuntu.com/ubuntu groovy-backports InRelease
Fetched 0 B in 6s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Wed Jul 14 08:30:31 2021) ===
=== Command terminated with exit status 1 (Wed Jul 14 08:30:41 2021) ===
and hold in terminal, no further action.
How to fix it and conduct full upgrade?