It looks like there was a network issue during your upgrade attempt:
# From VarLogDistupgradeMainlog.txt
2022-05-29 00:18:25,030 DEBUG url_downloadable:
http://in.archive.ubuntu.com/ubuntu//dists/impish/Release
2022-05-29 00:18:25,030 DEBUG s='http' n='in.archive.ubuntu.com'
p='/ubuntu//dists/impish/Release' q='' f=''
2022-05-29 00:20:35,526 DEBUG error from httplib: '<urlopen error [Errno 101]
Network is unreachable>'
If you have not already, please try the upgrade again after verifying
the network issue is resolved.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1976166
Title:
An error leading to crash/clash in the execution of the programme
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