Comment 10 for bug 943607

The problem is resolved in 12.04 - almost. In 12.04, with Spotify running (window open or no), Ubuntu will simply pause for a few seconds (10 to 20?) and then shutdown normally. Only a minor nuisance any way you look at it.

the output of "apt-cache policy spotify-client" is:
spotify-client:
  Installed: 1:0.8.3.278.g21c7566.632-1
  Candidate: 1:0.8.3.278.g21c7566.632-1
  Version table:
 *** 1:0.8.3.278.g21c7566.632-1 0
        500 http://repository.spotify.com/ stable/non-free amd64 Packages
        100 /var/lib/dpkg/status