2016-01-24 19:13:36,917 INFO Using config files '['./DistUpgrade.cfg.trusty']'
2016-01-24 19:13:36,917 INFO uname information: 'Linux localhost 3.14.0 #1 SMP Wed Jan 6 20:00:45 PST 2016 x86_64'
2016-01-24 19:13:36,917 INFO apt version: '1.0.1ubuntu2'
2016-01-24 19:13:36,917 INFO python version: '3.4.3 (default, Oct 14 2015, 20:28:29) 
[GCC 4.8.4]'
2016-01-24 19:13:36,918 INFO release-upgrader version '15.04.14.2' started
2016-01-24 19:13:36,925 INFO locale: 'en_US' 'UTF-8'
2016-01-24 19:13:36,930 INFO screen could not be run
2016-01-24 19:13:36,946 WARNING estimate_kernel_size_in_boot() returned '0'?
2016-01-24 19:13:36,988 DEBUG Using 'DistUpgradeViewText' view
2016-01-24 19:13:37,034 DEBUG aufsOptionsAndEnvironmentSetup()
2016-01-24 19:13:37,036 DEBUG using '/tmp/upgrade-rw-8y7ovtbt' as aufs_rw_dir
2016-01-24 19:13:37,036 DEBUG using '/tmp/upgrade-chroot-j2rwqkk0' as aufs chroot dir
2016-01-24 19:13:37,036 DEBUG enable dpkg --force-overwrite
2016-01-24 19:13:37,041 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2016-01-24 19:13:38,102 DEBUG lsb-release: 'trusty'
2016-01-24 19:13:38,103 DEBUG _pythonSymlinkCheck run
2016-01-24 19:13:38,103 DEBUG openCache()
2016-01-24 19:13:38,103 DEBUG No such plugin directory: ./plugins
2016-01-24 19:13:38,103 DEBUG plugins for condition 'PreCacheOpen' are '[]'
2016-01-24 19:13:38,103 DEBUG plugins for condition 'vividPreCacheOpen' are '[]'
2016-01-24 19:13:38,103 DEBUG plugins for condition 'from_trustyPreCacheOpen' are '[]'
2016-01-24 19:13:38,103 DEBUG quirks: running PreCacheOpen
2016-01-24 19:13:38,103 DEBUG running Quirks.PreCacheOpen
2016-01-24 19:13:38,665 DEBUG /openCache(), new cache size 73307
2016-01-24 19:13:38,666 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-gnome-desktop')
2016-01-24 19:13:38,666 DEBUG checkViewDepends()
2016-01-24 19:13:38,666 DEBUG running doUpdate() (showErrors=False)
2016-01-24 19:13:47,958 DEBUG openCache()
2016-01-24 19:13:51,175 DEBUG /openCache(), new cache size 73307
2016-01-24 19:13:51,175 DEBUG doPostInitialUpdate
2016-01-24 19:13:51,175 DEBUG plugins for condition 'PostInitialUpdate' are '[]'
2016-01-24 19:13:51,175 DEBUG plugins for condition 'vividPostInitialUpdate' are '[]'
2016-01-24 19:13:51,175 DEBUG plugins for condition 'from_trustyPostInitialUpdate' are '[]'
2016-01-24 19:13:53,629 DEBUG Foreign: dropbox google-chrome-stable
2016-01-24 19:13:53,629 DEBUG Obsolete: crouton-network-manager rstudio
2016-01-24 19:13:53,629 DEBUG updateSourcesList()
2016-01-24 19:13:53,750 DEBUG rewriteSourcesList()
2016-01-24 19:13:53,752 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse'
2016-01-24 19:13:53,752 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu/ vivid main restricted universe multiverse' updated to new dist
2016-01-24 19:13:53,752 DEBUG examining: 'deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse'
2016-01-24 19:13:53,753 DEBUG entry 'deb-src http://archive.ubuntu.com/ubuntu/ vivid main restricted universe multiverse' updated to new dist
2016-01-24 19:13:53,753 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse'
2016-01-24 19:13:53,753 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu/ vivid-updates main restricted universe multiverse' updated to new dist
2016-01-24 19:13:53,753 DEBUG examining: 'deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse'
2016-01-24 19:13:53,753 DEBUG entry 'deb-src http://archive.ubuntu.com/ubuntu/ vivid-updates main restricted universe multiverse' updated to new dist
2016-01-24 19:13:53,753 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse'
2016-01-24 19:13:53,753 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu/ vivid-security main restricted universe multiverse' updated to new dist
2016-01-24 19:13:53,753 DEBUG examining: 'deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse'
2016-01-24 19:13:53,754 DEBUG entry 'deb-src http://archive.ubuntu.com/ubuntu/ vivid-security main restricted universe multiverse' updated to new dist
2016-01-24 19:13:53,754 DEBUG examining: 'deb http://dl.google.com/linux/chrome/deb/ stable main'
2016-01-24 19:13:53,757 DEBUG entry '# deb http://dl.google.com/linux/chrome/deb/ stable main # disabled on upgrade to vivid' was disabled (unknown mirror)
2016-01-24 19:13:53,758 DEBUG examining: 'deb [arch=i386,amd64] http://linux.dropbox.com/ubuntu trusty main'
2016-01-24 19:13:53,761 DEBUG entry '# deb [arch=i386,amd64] http://linux.dropbox.com/ubuntu vivid main # disabled on upgrade to vivid' was disabled (unknown mirror)
2016-01-24 19:13:58,065 DEBUG running doUpdate() (showErrors=True)
2016-01-24 19:14:17,040 DEBUG openCache()
2016-01-24 19:14:17,041 DEBUG failed to SystemUnLock() (E:Not locked) 
2016-01-24 19:14:20,245 DEBUG /openCache(), new cache size 76276
2016-01-24 19:14:20,246 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-gnome-desktop')
2016-01-24 19:14:22,466 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'
2016-01-24 19:14:22,467 DEBUG abort called
2016-01-24 19:14:22,468 DEBUG openCache()
2016-01-24 19:14:25,682 DEBUG /openCache(), new cache size 73307
2016-01-24 19:14:25,682 DEBUG enabling apt cron job