>From Mainlog.txt:

2015-09-12 22:52:54,133 DEBUG failed to SystemUnLock() (E:Not locked) 
2015-09-12 22:52:57,841 DEBUG /openCache(), new cache size 73536
2015-09-12 22:52:57,842 DEBUG need_server_mode(): can not find a desktop meta 
package or key deps, running in server mode
2015-09-12 22:53:00,470 DEBUG Running KeepInstalledSection rules
2015-09-12 22:53:01,333 DEBUG Kernel uname: '3.13.0-64-generic' 
2015-09-12 22:53:01,344 DEBUG nvidiaUpdate()
2015-09-12 22:53:02,614 INFO no old nvidia driver installed, installing no new
2015-09-12 22:53:02,615 DEBUG plugins for condition 'PostDistUpgradeCache' are 
'[]'
2015-09-12 22:53:02,615 DEBUG plugins for condition 
'utopicPostDistUpgradeCache' are '[]'
2015-09-12 22:53:02,615 DEBUG plugins for condition 
'from_trustyPostDistUpgradeCache' are '[]'
2015-09-12 22:53:02,705 DEBUG blacklist expr 'ubuntu-release-upgrader' matches 
'ubuntu-release-upgrader-gtk'
2015-09-12 22:53:02,705 DEBUG The package 'ubuntu-release-upgrader-gtk' is 
marked for removal but it's in the removal blacklist

It looks like you don't have any of the -meta packages installed. Please
install one of them for ubuntu-release-upgrader to work. From the code:

# Distro contains global information about the upgrade
[Distro]
# the meta-pkgs we support
MetaPkgs=ubuntu-desktop, kubuntu-desktop, xubuntu-core,
   xubuntu-desktop, ubuntustudio-desktop, mythbuntu-desktop,
   kubuntu-netbook, lubuntu-core, lubuntu-desktop, ubuntu-gnome-desktop


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1495142

Title:
  upgrade from a freshly installed 14.04.3 to 14.10 fails

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