Comment 7 for bug 736743

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Natty (development branch)
Release: 11.04
Codename: natty
  Installed: (none)
  Candidate: 1.99~rc1-13ubuntu1
  Version table:
     1.99~rc1-13ubuntu1 0
        500 natty/universe i386 Packages

Same here. Seems to be a btrfs thing as I have never seen this and is the first time I have used btrfs.