Public bug reported:

In spite of apparent fixes for [bug #1342424] I find that the update-
manager is still crashing and failing to perform the HWE upgrade to move
my 12.04.4 LTS installation.

If I run the update-manager from the command line I get the same
behaviour as the normal alert when updates are availabe, but also
additional information. It proceds correctly until it has asked for the
sudoer password, then it prints the error messages and triggers a crash
report.

$ /usr/bin/update-manager
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 473, in 
_inline_callbacks
    result = gen.throw(result.type, result.value, result.traceback)
  File 
"/usr/lib/python2.7/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py",
 line 54, in commit
    yield self._run_in_dialog(trans, self.INSTALL)
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 473, in 
_inline_callbacks
    result = gen.throw(result.type, result.value, result.traceback)
  File 
"/usr/lib/python2.7/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py",
 line 75, in _run_in_dialog
    yield dia.run()
aptdaemon.errors.TransactionFailed: Transaction failed: None
 The following packages have unmet dependencies:

libgl1-mesa-glx-lts-trusty: Depends: libglapi-mesa-lts-trusty (= 
10.1.3-0ubuntu0.1~precise1) but 10.1.3-0ubuntu0.1~precise1 is to be installed
                            Depends: libx11-6 (>= 2:1.4.99.1) but 
2:1.4.99.1-0ubuntu2.2 is to be installed
                            Depends: libxdamage1 (>= 1:1.1) but 1:1.1.3-2build1 
is to be installed
xserver-xorg-lts-trusty: Depends: xserver-xorg-core-lts-trusty (>= 2:1.11) but 
2:1.15.1-0ubuntu2~precise1 is to be installed

What I expect is the system to (A) correctly resolve and install the
dependancies to get the HWE update, and (B) if it can't do that to not
crash out when reporting the cause.

Other systems details are:

$ apt-cache policy update-manager
update-manager:
  Installed: 1:0.156.14.16
  Candidate: 1:0.156.14.16
  Version table:
 *** 1:0.156.14.16 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     1:0.156.14.5 0
        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 
Packages
     1:0.156.14 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        
$ uname -a
Linux pscpc 3.8.0-44-generic #66~precise1-Ubuntu SMP Tue Jul 15 04:01:04 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux

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

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https://bugs.launchpad.net/bugs/1350310

Title:
  update-manager chashes on 12.04.4 HWE update

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