Distribution upgrade arbitrarily uninstalls packages without any need

[Teo]

I had installed Avant Window Navigator on 12.04 to overcome the demential mixing of icons in Unity's launcher where launcher icons to open new applications are stupidly mixed with icons of existing open or minimized windows (because Apple does it doesn't mean it's a good idea).

I have upgraded to 12.10 and Avant Window Navigator has been uninstalled. I see no reason for uninstalling a software that the user has installed. Especially when nothing has been done to make it unnecessary (the way icons are organized in Unity's launcher hasn't been improved the slightest bit).

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: update-manager 1:0.174.3
ProcVersionSignature: Ubuntu 3.5.0-22.34-generic 3.5.7.2
Uname: Linux 3.5.0-22-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu9
Aptdaemon:

Architecture: i386
Date: Sun Jan 13 12:47:26 2013
InstallationDate: Installed on 2010-06-23 (935 days ago)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to quantal on 2013-01-13 (0 days ago)

[Phillip Susi (psusi)]

This package was removed because it has not been maintained upstream and no longer works with current versions of vala.