[Bug 1874870] Re: focal do-release-upgrade broken: incompatible ksh93 replacement

[Jens Elkner]

Perhaps I should add, that this renders the machines un-bootable,
because several scripts require ksh93, e.g. udev scripts, which create
the device links for zpool related devices.

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https://bugs.launchpad.net/bugs/1874870

Title:
  focal do-release-upgrade broken: incompatible ksh93 replacement

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  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.).

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