I can confirmed that the recent patch to utils.py fixes the problem on Ubuntu 12.04 to 14.04 upgrades.
The utils.py code has been around for a while, so I think this problem may also effect other upgrades (eg 10.04 to 12.04).
I can confirmed that the recent patch to utils.py fixes the problem on Ubuntu 12.04 to 14.04 upgrades.
The utils.py code has been around for a while, so I think this problem may also effect other upgrades (eg 10.04 to 12.04).