Comment 9 for bug 1936437

Version 4.4.0-5 didn't need the "reinstall iputils-ping" delta so apparently this got fixed somewhere else (thanks Sergio for figuring this out and syncing). The Debian d/changelog has:

backuppc (4.4.0-5) unstable; urgency=medium

  [ Simon McVittie ]
  * debian/rules: Specify canonical path to ping6. (Closes: #992647)

That Debian bug is about a *different* issue, but maybe using the canonical path somehow made a difference, who knows.

Speaking of Focal (the only open task here): we should verify if the same change fixes the issue there. The autopkgtest is hinted there, so this is non-blocking. I'm setting the Focal status to Incomplete for now as the whole issue is in my opinion not well understood.