[Bug 1112336] Re: [hardy->lucid] unresolvable problem occurred while calculating the upgrade

[Fionn]

I found the cause of this problem:
A held package was blocking python from being upgraded properly.

The error messages of the upgrader were not very helpful in finding out
the real reason, though. It might be a good idea to have the updater
issue a general, prominent warning when it encounters held packages on
the system BEFORE caclulating the upgrade - or at least if calculating
an upgrade fails.


** Summary changed:

- [hardy->lucid] unresolvable problem occurred while calculating the upgrade
+ held packages can cause "unresolvable problem" error on upgrade. no comprehensive hint given.

** Summary changed:

- held packages can cause "unresolvable problem" error on upgrade. no comprehensive hint given.
+ held packages may cause "unresolvable problem" error on upgrade. no comprehensive hint given.

** Attachment removed: "Required log files (see bug text)"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1112336/+attachment/3510077/+files/var-log-dist-upgrade.tbz

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1112336

Title:
  held packages may cause "unresolvable problem" error on upgrade. no
  comprehensive hint given.

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  Since hardy is nearing the end of its support cycle I initiated an upgrade to lucid. Unfortunately it failed miserably.
  What I tried so far:

  * disabling (the single one) ppa we had (git) and uninstall their git packages
  * looking for broken packages (none found)
  * making sure everything is the latest version
  * starting do-release-upgrade in server and desktop mode (wont help)

  Now I am out of ideas. Uninstalling update-manager-core looks like
  being a really bad move for an update so I didnt try that one.

  -----------------------------------------------------------------------
  root at server:~# do-release-upgrade -m server
  Checking for a new ubuntu release
  Done Upgrade tool signature
  Done Upgrade tool
  Done downloading
  authenticate 'lucid.tar.gz' against 'lucid.tar.gz.gpg'
  extracting 'lucid.tar.gz'
  tar: Removing leading `/' from member names

  Reading cache

  Checking package manager
  Reading package lists: Done
  Reading state information: Done
  Reading state information: Done
  Reading state information: Done
  Done downloading
  Reading package lists: Done
  Reading state information: Done
  Reading state information: Done
  Reading state information: Done
  No candidate ver:  libpci2
  No candidate ver:  libntfs-3g16
  No candidate ver:  libldap2
  No candidate ver:  libopencdk8
  No candidate ver:  libsnmp10
  No candidate ver:  vmware-server
  No candidate ver:  libdirectfb-0.9-25
  No candidate ver:  libntfs-3g12
  No candidate ver:  libcrypto++6

  Updating repository information
  WARNING: Failed to read mirror file
  Done downloading            

  Checking package manager
  Reading package lists: Donelucid-security/multiverse Packages: 98  9  
  Reading state information: Done
  Reading state information: Done
  Reading state information: Done

  Calculating the changes
  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade: 
  The package 'update-manager-core' 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 

  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. 

  
  Restoring original system state

  Aborting
  Reading package lists: Done hardy-security/multiverse Packages: 98  9  
  Reading state information: Done

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1112336/+subscriptions