Downgrading is not supported.
Downgrading with the result that files / bugfixes present in the
-updates pocket are not installed because you only installed from the
release pocket is not a bug in Ubuntu. Any changes we make to a stable
release after GA land only in the -updates pocket, never in the release
pocket. So there is nothing we would change here to make this problem
go away.
The reason you saw the error is that /etc/profile.d/01-locale-fix.sh and
/usr/bin/locale-check were both introduced to bionic after release, so
are only in bionic-updates. However, /usr/bin/locale-check is a regular
packaged file, and /etc/profile.d/01-locale-fix.sh is a conffile; which
means that on downgrade, /usr/bin/locale-check is removed because it's
not part of the older package, but /etc/profile.d/01-locale-fix.sh is
not removed because conffiles are only removed with additional handling
via the maintainer scripts, and there is no handling that would remove
this conffile as part of a downgrade.
Almost no conffiles are correctly removed on downgrade to a version of
the package earlier than the version which introduced the conffile.
This is why downgrades are not supported.
** Changed in: base-files (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1837300
Title:
/usr/bin/locale-check is missing from bionic LTS versions
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