In case other people have this problem, I have been able to work around
it by using the procedure given in the answer to this StackOverflow
post: https://askubuntu.com/questions/458201/how-can-i-upgrade-ubuntu-
to-newer-release-manually-without-using-update-manager
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You received this bug
** Package changed: python-defaults (Ubuntu) => update-manager-core
(Ubuntu)
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https://bugs.launchpad.net/bugs/1901173
Title:
Updating focal to groovy fails
To manage notifications
Public bug reported:
Running `do-release-upgrade` from focal to groovy, I got the following
crash after the packages were downloaded:
```
apt_pkg.Error: E:Could not configure 'libc6:amd64'. , E:Could not perform
immediate configuration on 'libnss-nis:amd64'. Please see man 5 apt.conf under
Still happening on 19.10 (updated from 18.10, which had previously been
updated from 18.04)
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https://bugs.launchpad.net/bugs/1713615
Title:
ttf-mscorefonts-installer fails because
