[Bug 832900] [NEW] pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

[Patrik Nilsson]

Public bug reported:

Today I manually checked for updates with update manager. The 'check'
for updates worked well and when I was going to install the updates.
First time I was asked for the password, I entered an invalid one.

Then I got errors when I was trying to install. See below. It was all
solved by: "sudo dpkg --configure -a". Synaptic couldn't solve it.

patrik at ubuntu:~$ lsb_release -rd
Description:	Ubuntu 11.04
Release:	11.04
patrik at ubuntu:~$ apt-cache policy update-manager
update-manager:
  Installed: 1:0.150.3
  Candidate: 1:0.150.3
  Version table:
 *** 1:0.150.3 0
        500 http://archive.ubuntu.com/ubuntu/ natty-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1:0.150 0
        500 http://archive.ubuntu.com/ubuntu/ natty/main i386 Packages
patrik at ubuntu:~$ 

##### Output of errors

An unresolvable problem occurred while calculating the upgrade.

Please report this bug against the 'update-manager' package and include the following error message:
'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

#####

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 961, in simulate
    trans.unauthenticated = self._simulate_helper(trans)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1011, in _simulate_helper
    self._get_broken_details(trans))
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1199, in _get_broken_details
    for dep in version.dependencies:
AttributeError: 'NoneType' object has no attribute 'dependencies'
update-manager

#####

Could not initialize the package information

An unresolvable problem occurred while initializing the package
information.

Please report this bug against the 'update-manager' package and include
the following error message:

'E:Unable to correct problems, you have held broken packages.'

#####

patrik at ubuntu:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
E: Unmet dependencies. Try using -f.
patrik at ubuntu:~$ sudo apt-get -f install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... failed.
The following packages have unmet dependencies:
E: Unable to correct problems, you have held broken packages.
E: Unable to correct dependencies

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/832900

Title:
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages.

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

Bug description:
  Today I manually checked for updates with update manager. The 'check'
  for updates worked well and when I was going to install the updates.
  First time I was asked for the password, I entered an invalid one.

  Then I got errors when I was trying to install. See below. It was all
  solved by: "sudo dpkg --configure -a". Synaptic couldn't solve it.

  patrik at ubuntu:~$ lsb_release -rd
  Description:	Ubuntu 11.04
  Release:	11.04
  patrik at ubuntu:~$ apt-cache policy update-manager
  update-manager:
    Installed: 1:0.150.3
    Candidate: 1:0.150.3
    Version table:
   *** 1:0.150.3 0
          500 http://archive.ubuntu.com/ubuntu/ natty-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:0.150 0
          500 http://archive.ubuntu.com/ubuntu/ natty/main i386 Packages
  patrik at ubuntu:~$ 

  ##### Output of errors

  An unresolvable problem occurred while calculating the upgrade.

  Please report this bug against the 'update-manager' package and include the following error message:
  'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

  #####

  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 961, in simulate
      trans.unauthenticated = self._simulate_helper(trans)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1011, in _simulate_helper
      self._get_broken_details(trans))
    File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1199, in _get_broken_details
      for dep in version.dependencies:
  AttributeError: 'NoneType' object has no attribute 'dependencies'
  update-manager

  #####

  Could not initialize the package information

  An unresolvable problem occurred while initializing the package
  information.

  Please report this bug against the 'update-manager' package and
  include the following error message:

  'E:Unable to correct problems, you have held broken packages.'

  #####

  patrik at ubuntu:~$ sudo apt-get upgrade
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  You might want to run 'apt-get -f install' to correct these.
  The following packages have unmet dependencies:
  E: Unmet dependencies. Try using -f.
  patrik at ubuntu:~$ sudo apt-get -f install
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Correcting dependencies... failed.
  The following packages have unmet dependencies:
  E: Unable to correct problems, you have held broken packages.
  E: Unable to correct dependencies

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