Public bug reported:

When running Ubuntu Resolute in Docker (using the ubuntu:resolute Docker
image), since about three days ago, I cannot create tar archives of
/usr/share anymore. This breaks a continuous integration workflow where
we automatically build Debian/Ubuntu packages.

What happens is that for some reason, tar complains that it cannot stat
/usr/share. Here is an example command that reproduces the problem:

  # tar -c /usr/share > /dev/null
  tar: Removing leading `/' from member names
  tar: /usr/share: Cannot stat: Function not implemented
  tar: Exiting with failure status due to previous error

This happens with package versions 1.35+dfsg-4ubuntu0.2 (the one
currently shipped in the Docker image) and  1.35+dfsg-4ubuntu0.3 (the
one installed by apt update).

However, downgrading to 1.35+dfsg-4 fixes the problem and gives the
expected output:

  # tar -c /usr/share > /dev/null
  tar: Removing leading `/' from member names

So this seems to point to a regression introduced by an Ubuntu patch.

** Affects: tar (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2161288

Title:
  Regression: tar cannot create archives of /usr/share, errors out with
  “Cannot stat: Function not implemented”

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