[Bug 1086548] Re: libc-bin/libc6 inverted deps causes nss to fail and can make dpkg-statoverride explode, killing the upgrade

[Michael Vogt]

Hi, looking at the logs it seems to be relatively specific to the setup
in use. Adding a workaround is easy enough for the specific case, I
attached it here.

Making this general is a bit more tricky, but would involve scanning
/etc/passwd and /etc/group and then comparing that to the dpkg-
statusoverride --list output.

** Patch added: "First iteration of a fix, lacking a test"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1086548/+attachment/3451988/+files/lp1086548.diff

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https://bugs.launchpad.net/bugs/1086548

Title:
  libc-bin/libc6 inverted deps causes nss to fail and can make dpkg-
  statoverride explode, killing the upgrade

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  I've just had a lucid -> precise upgrade explode in my face.  libc-bin
  was installed before libc6 and as a result, there was a period where
  nss was broken, after libc-bin had been upgraded, but before libc6
  had.  nss being broken caused dpkg-statoverride to explode on almost
  any use (because there was a override that used a group provided by
  NSS, not in /etc/group).  dpkg-statoverride failing caused the libc6
  install to fail and subsequently do-release-upgrade also.  I've
  attached the dist-upgrade logs from the failed run.

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