It looks like the upgrade failure is ultimately caused by pacakges from
the ondrej/php PPA. In particular, libgd3
2.3.0-2+ubuntu16.04.1+deb.sury.org+1 depends on a version of libpng12-0
that creates a conflict for usrmerge.
Please try removing packages from ondrej/php using the `ppa-purge` tool,
and then try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1976195
Title:
Upgrade abort from ubuntu 20.04 to ubuntu 21.10
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