thank you
Despite having purged the PPA's previously. I needed to reinstall the
PPA's and then re-purge them. That solved my issue.
FWIW I used this bash script to find my 'installed' PPA's.
find /etc/apt/sources.list.d -type f -name "*.list" -print0 | \
while read -d $'\0' file; do awk -F/ '/deb / && /ppa\.launchpad\.net/
{print "sudo ppa-purge ppa:"$4"/"$5}' "$file"; done
reference: https://askubuntu.com/questions/646884/how-can-i-remove-all-
ppa
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https://bugs.launchpad.net/bugs/1887739
Title:
20.04 failed to calculate upgrade issue
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