Ran the following script to find any packages that had been installed
from other sources and removed them all.
#!/bin/sh
# Print packages installed from different origins.
# Exclude standard Ubuntu repositories.
grep -H '^Origin:' /var/lib/apt/lists/*Release | grep -v ' Ubuntu$' | sort -u \
| while read -r line; do
origin=${line#* }
echo $origin:
list=${line%%:*}
sed -rn 's/^Package: (.*)$/\1/p' ${list%_*Release}*Packages | sort -u \
| xargs -r dpkg -l 2>/dev/null | grep '^.i '
echo
done
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1902366
Title:
Cannot upgrade 18.04 to 20.04
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1902366/+subscriptions
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