Comment 11 for bug 1250611

In the meantime, I simply skipped 12.04.1 postinst with this:

  dpkg -l | grep -qE 'shim-signed[[:space:]]+1\.5~12\.04\.1' && sed -i '1a exit 0' /var/lib/dpkg/info/shim-signed.postinst
  apt-get update && apt-get dist-upgrade && apt-get dist-upgrade

I had to run dist-upgrade twice, once to finish setting up 12.04.1 and the last to effectively install 12.04.2