** Description changed:

+ TEST CASE:
+ 1. install xubuntu-desktop and ubuntu-desktop
+ 2. ensure that libsdl1.2debian-alsa is installed
+ 3. run do-release-upgrade
+ 4. verify that the upgrade can not be calculated
+ 5. run "do-release-upgrade --proposed
+ 6. verify that it can be calculated now
+ 
  Binary package hint: update-manager
  
  When running sudo update-manager -d from 9.10, error message appears as
  follows:
  
  first, here's the terminal dump -
  
+ 
  $ sudo update-manager -d
  extracting 'lucid.tar.gz'
- authenticate 'lucid.tar.gz' against 'lucid.tar.gz.gpg' 
+ authenticate 'lucid.tar.gz' against 'lucid.tar.gz.gpg'
  tar: Removing leading `/' from member names
  WARNING: Failed to read mirror file
  
  now, the error message in the dialog box that pops up -
  
  Could not calculate the upgrade
  
  An unresolvable problem occurred while calculating the upgrade:
  The package 'ubuntu-desktop' is marked for removal but it is in the removal 
blacklist.
  
-  This can be caused by:
-  * Upgrading to a pre-release version of Ubuntu
-  * Running the current pre-release version of Ubuntu
-  * Unofficial software packages not provided by Ubuntu
+  This can be caused by:
+  * Upgrading to a pre-release version of Ubuntu
+  * Running the current pre-release version of Ubuntu
+  * Unofficial software packages not provided by Ubuntu
  
  If none of this applies, then please report this bug against the
  'update-manager' package and include the files in /var/log/dist-upgrade/
  in the bug report.
  
  Attached are the files from /var/log/dist-upgrade.
  
  ProblemType: Bug
  Architecture: i386
  Date: Thu Apr 29 09:43:24 2010
  DistroRelease: Ubuntu 9.10
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
  Package: update-manager 1:0.126.9
  PackageArchitecture: all
  ProcEnviron:
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-21.59-generic
  SourcePackage: update-manager
  Uname: Linux 2.6.31-21-generic i686
  XsessionErrors:
-  (gnome-settings-daemon:1633): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
-  (gnome-settings-daemon:1633): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
-  (polkit-gnome-authentication-agent-1:1705): GLib-CRITICAL **: 
g_once_init_leave: assertion `initialization_value != 0' failed
-  (nautilus:1693): Eel-CRITICAL **: eel_preferences_get_boolean: assertion 
`preferences_is_initialized ()' failed
-  (firefox:2117): GLib-WARNING **: g_set_prgname() called multiple times
+  (gnome-settings-daemon:1633): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
+  (gnome-settings-daemon:1633): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
+  (polkit-gnome-authentication-agent-1:1705): GLib-CRITICAL **: 
g_once_init_leave: assertion `initialization_value != 0' failed
+  (nautilus:1693): Eel-CRITICAL **: eel_preferences_get_boolean: assertion 
`preferences_is_initialized ()' failed
+  (firefox:2117): GLib-WARNING **: g_set_prgname() called multiple times

-- 
system upgrade 9.10 --> 10.04 could not calculate upgrade when both 
xubuntu-desktop and ubuntu-desktop are installed
https://bugs.launchpad.net/bugs/571743
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