Error in do-release-upgrade from saucy to trusty

Attempting in in-place upgrade of saucy to trusty using "do-release-upgrade". I get an error returned "The value 'saucy' is invalid for APT::Default-Release as such a release is not available in the sources". From some reading this seems to be an issue with 3rd party sources but I've commented those out.

1. Edit /etc/apt/sources.list to pull out everything not critical. This was just "saucy main restricted" and "saucy-updates main restricted"
2. Removed anything 3rd party from sources.list.d
3. sudo apt-get update
4. sudo apt-get dist-upgrade
5. sudo do-release-upgrade

There's a failure when manipulating the sources.list file in the upgrade process. The log file shows the following
2014-10-19 03:17:15,237 DEBUG updateSourcesList()
2014-10-19 03:17:15,301 DEBUG rewriteSourcesList()
2014-10-19 03:17:15,303 DEBUG examining: 'deb http://us.archive.ubuntu.com/ubuntu/ saucy main restricted'
2014-10-19 03:17:15,303 DEBUG entry 'deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricted' updated to new dist
2014-10-19 03:17:15,303 DEBUG examining: 'deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates main restricted'
2014-10-19 03:17:15,303 DEBUG entry 'deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted' updated to new dist
2014-10-19 03:17:15,304 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu saucy-security main restricted'
2014-10-19 03:17:15,304 DEBUG entry 'deb http://security.ubuntu.com/ubuntu trusty-security main restricted' updated to new dist
2014-10-19 03:17:15,305 DEBUG running doUpdate() (showErrors=True)
2014-10-19 03:17:19,499 DEBUG openCache()
2014-10-19 03:17:19,499 DEBUG failed to SystemUnLock() (E:Not locked)
2014-10-19 03:17:20,686 ERROR not handled exception:
Traceback (most recent call last):

  File "/tmp/ubuntu-release-upgrader-7kj7sk/trusty", line 10, in <module>
    sys.exit(main())

  File "/tmp/ubuntu-release-upgrader-7kj7sk/DistUpgrade/DistUpgradeMain.py", line 244, in main
    if app.run():

  File "/tmp/ubuntu-release-upgrader-7kj7sk/DistUpgrade/DistUpgradeController.py", line 1827, in run
    return self.fullUpgrade()

  File "/tmp/ubuntu-release-upgrader-7kj7sk/DistUpgrade/DistUpgradeController.py", line 1736, in fullUpgrade
    self.openCache(restore_sources_list_on_fail=True)

  File "/tmp/ubuntu-release-upgrader-7kj7sk/DistUpgrade/DistUpgradeController.py", line 219, in openCache
    return self._openCache(lock)
  File "/tmp/ubuntu-release-upgrader-7kj7sk/DistUpgrade/DistUpgradeController.py", line 247, in _openCache
    lock)

  File "/tmp/ubuntu-release-upgrader-7kj7sk/DistUpgrade/DistUpgradeCache.py", line 116, in __init__
    apt.Cache.__init__(self, progress)

  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 105, in __init__
    self.open(progress)

  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 150, in open
    self._cache = apt_pkg.Cache(progress)

SystemError: E:The value 'saucy' is invalid for APT::Default-Release as such a release is not available in the sources