Public bug reported:
An upgrade from bionic to focal as described on https://linuxconfig.org
/how-to-upgrade-ubuntu-to-20-04-lts-focal-fossa via do-release-upgrade
-d breaks the system, because ksh93 gets removed and the incompatible,
experimental ksh2020 gets installed.
Don't do that. ksh2020 is NOT ksh93, it is not even maintained anymore.
ksh2020 was a try of 2 completely inexperienced people, knowing C but
had no clue about ksh93.
NOTE: The current change will break a lot of scripts/apps as well,
because people using ksh93 features will have '#!/bin/ksh93' in their
scripts (similar to python2 and python3, etc.).
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1874870
Title:
focal do-release-upgrade broken: incompatible ksh93 replacement
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