Comment by mehrdadn

Just tried upgrading on WSL and I got an endless loop of

  sleep: cannot read realtime clock: Invalid argument

Ctrl+C and then I get

  $ sudo apt --fix-broken install
  ...
  Setting up libc6:amd64 (2.31-0ubuntu9) ...
  Checking for services that may need to be restarted...
  Checking init scripts...
  Nothing to restart.
  sleep: cannot read realtime clock: Invalid argument
  dpkg: error processing package libc6:amd64 (--configure):
   installed libc6:amd64 package post-installation script subprocess returned error exit status 1

and I have no clue how to fix this. (Edit: Found a fix. [1]) For the life of me I don't get how people always say upgrades are so easy on Ubuntu. I practically never have a pain-free Ubuntu upgrade experience... never. And while this particular issue appears WSL-related, I'm not just talking about WSL. There's always some random things breaking in the middle.

Update: After fixing that and upgrading everything, now I get this nonsense:

  The following packages have been kept back:
    libpython3.8 libpython3.8-dev libpython3.8-minimal python3.8 python3.8-minimal

  $ sudo apt-get install --upgrade python3.8
  ...
  The following packages have unmet dependencies:
   python3.8 : Depends: python3.8-minimal (= 3.8.2-1+bionic1) but 3.8.2-1ubuntu1 is to be installed
               Depends: libpython3.8-stdlib (= 3.8.2-1+bionic1) but 3.8.2-1ubuntu1 is to be installed
  E: Unable to correct problems, you have held broken packages.

  $ sudo apt-get install libpython3.8-stdlib
  ...
  The following packages have unmet dependencies:
   libpython3.8-stdlib : Depends: libffi6 (>= 3.0.4) but it is not installable
                         Depends: libreadline7 (>= 7.0~beta) but it is not installable

[1] https://github.com/microsoft/WSL/issues/4898#issuecomment-61...