completion should support ubuntu-bug

It would nice to have a completion functionality for the "ubuntu-bug" command. I believe it should be the same as "apt-get remove".

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: zsh 4.3.17-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
NonfreeKernelModules: prl_fs_freeze prl_fs prl_tg prl_eth
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Fri Nov 9 12:59:35 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
SourcePackage: zsh
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.zsh.zshrc: [modified]
mtime.conffile..etc.zsh.zshrc: 2012-11-04T15:23:36