cannot remove gwibber

I cannot uninstall gwibber:

# aptitude purge gwibber gwibber-service libgwibber2 gwibber-service-identica gwibber-service-twitter gwibber-service-facebook libgwibber-gtk2
The following packages will be REMOVED:
  gwibber{p} gwibber-service{p} gwibber-service-facebook{p} gwibber-service-identica{p} gwibber-service-twitter{p}
  libgwibber-gtk2{p} libgwibber2{p}
0 packages upgraded, 0 newly installed, 7 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 2503 kB will be freed.
The following packages have unmet dependencies:
  ubuntu-desktop: Depends: gwibber but it is not going to be installed.
The following actions will resolve these dependencies:

      Remove the following packages:
1) acroread
2) libatk1.0-0
3) libaudio2
4) libavahi-client3
5) libavahi-common3
6) libc6
7) libcairo2
8) libcomerr2
9) libcups2
10) libdatrie1
11) libdbus-1-3
12) libexpat1
13) libffi6
14) libfontconfig1
15) libfreetype6
16) libgcc1
17) libgcrypt11
18) libgdk-pixbuf2.0-0
19) libglib2.0-0
20) libgnutls26
21) libgpg-error0
22) libgssapi-krb5-2
23) libgtk2.0-0
24) libice6
25) libjasper1
26) libjpeg62
27) libk5crypto3
28) libkeyutils1
29) libkrb5-3
30) libkrb5support0
31) liblcms1
32) libmng1
33) libpango1.0-0
34) libpcre3
35) libpixman-1-0
36) libpng12-0
37) libqt4-core
38) libqt4-dbus
39) libqt4-declarative
40) libqt4-network
41) libqt4-script
42) libqt4-sql
43) libqt4-test
44) libqt4-xml
45) libqt4-xmlpatterns
46) libqtcore4
47) libqtgui4
48) libselinux1
49) libsm6
50) libstdc++6
51) libtasn1-3
52) libthai0
53) libtiff4
54) libuuid1
55) libx11-6
56) libxau6
57) libxcb-render0
58) libxcb-shm0
59) libxcb1
60) libxcomposite1
61) libxcursor1
62) libxdamage1
63) libxdmcp6
64) libxext6
65) libxfixes3
66) libxft2
67) libxi6
68) libxinerama1
69) libxrandr2
70) libxrender1
71) libxss1
72) libxt6
73) nspluginviewer
74) nspluginwrapper
75) ubuntu-desktop
76) zlib1g

      Leave the following dependencies unresolved:
77) libqtgui4 recommends libcups2

Accept this solution? [Y/n/q/?] ^C

why can't I get rid of a user package I will never use?
why is the ubuntu-desktop dependency a requirement and not a recommendation?

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gwibber-service 3.2.1-0ubuntu1.3
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Wed Feb 29 10:35:21 2012
ExecutablePath: /usr/bin/gwibber-service
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
SourcePackage: gwibber
UpgradeStatus: No upgrade log present (probably fresh install)