Comment 6 for bug 1069160

In /var/log/dist-upgrade/.../main.log I found this:

...
2014-04-18 16:31:21,646 DEBUG entry '# deb http://ppa.launchpad.net/linrunner/thinkpad-extras/ubuntu trusty main # disabled on upgrade to trusty' was disabled (unknown mirror)
2014-04-18 16:31:21,646 DEBUG examining: 'deb http://ppa.launchpad.net/linrunner/tlp/ubuntu saucy main'
2014-04-18 16:31:21,648 DEBUG entry '# deb http://ppa.launchpad.net/linrunner/tlp/ubuntu trusty main # disabled on upgrade to trusty' was disabled (unknown mirror)
2014-04-18 16:31:25,640 DEBUG running doUpdate() (showErrors=True)
2014-04-18 16:31:31,997 DEBUG openCache()
2014-04-18 16:31:31,997 DEBUG failed to SystemUnLock() (E:Not locked)
2014-04-18 16:31:35,157 DEBUG /openCache(), new cache size 70583
2014-04-18 16:31:35,157 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'kubuntu-desktop')
2014-04-18 16:31:37,561 DEBUG Running KeepInstalledSection rules
2014-04-18 16:31:38,497 DEBUG Kernel uname: '3.11.0-19-generic'
2014-04-18 16:31:38,504 DEBUG nvidiaUpdate()
2014-04-18 16:31:39,861 INFO no old nvidia driver installed, installing no new
2014-04-18 16:31:39,862 DEBUG Upgrading 'brasero' (Distro PostUpgradeUpgrade rule)
2014-04-18 16:31:39,862 DEBUG Upgrading 'edubuntu-desktop' (Distro PostUpgradeUpgrade rule)
2014-04-18 16:31:39,862 DEBUG Removing 'libflashsupport' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'kvm-source' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'gtk-qt-engine' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'libparted1.8-12' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'usplash' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'printconf' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'foomatic-db-gutenprint' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'ebox-printers' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'kbluetooth' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'kde-plasmoid-cwp' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,862 DEBUG Removing 'kdm' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,863 DEBUG Removing 'xsettings-kde' (Distro PostUpgradeRemove rule)
2014-04-18 16:31:39,863 DEBUG Removing 'powermanagement-interface' (kubuntu-desktop PostUpgradeRemove rule)
2014-04-18 16:31:39,863 DEBUG Removing 'guidance-power-manager' (kubuntu-desktop PostUpgradeRemove rule)
2014-04-18 16:31:39,863 DEBUG Removing 'kde-guidance-powermanager' (kubuntu-desktop PostUpgradeRemove rule)
2014-04-18 16:31:39,863 DEBUG Purging 'ltsp-client' (Distro PostUpgradePurge rule)
2014-04-18 16:31:39,863 DEBUG Purging 'ltspfsd' (Distro PostUpgradePurge rule)
2014-04-18 16:31:39,863 DEBUG Purging 'linux-restricted-modules-common' (Distro PostUpgradePurge rule)
2014-04-18 16:31:39,863 DEBUG plugins for condition 'PostDistUpgradeCache' are '[]'
2014-04-18 16:31:39,863 DEBUG plugins for condition 'trustyPostDistUpgradeCache' are '[]'
2014-04-18 16:31:39,863 DEBUG plugins for condition 'from_saucyPostDistUpgradeCache' are '[]'
2014-04-18 16:31:40,149 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'
2014-04-18 16:31:40,149 DEBUG abort called
2014-04-18 16:31:40,150 DEBUG openCache()
2014-04-18 16:31:43,469 DEBUG /openCache(), new cache size 67282
2014-04-18 16:31:43,470 DEBUG enabling apt cron job