Thinking about this more I suspect what happened was that the release
upgrade process (running 'sudo do-release-upgrade -m desktop') was
interrupted at a point after it had modified your /etc/apt/sources.list
file to focal. Then when 'dist-upgrade' was run because your
sources.list file now containted focal all the packages from focal were
installed. The release upgrade process should do a better job of
restoring your sources.list file in the event that it is interrupted
(Ctrl-C).
Also for what its worth do-release-upgrade has a '-c' switch which
specifically only checks if a new distribution release is available.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Expired => Confirmed
** Summary changed:
- upgrade to 20.04 is quite invasive
+ interruption of dist-upgrade can leave you next release in sources.list
** Tags added: rls-ff-incoming
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https://bugs.launchpad.net/bugs/1898026
Title:
interruption of dist-upgrade can leave you next release in
sources.list
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