Comment 88 for bug 153980

@Joe I'm afraid that the upgrade from feisty has become even more difficult since Apr 18, gutsy's end of life.

Before performing any of the steps below, make sure you have full backups of your current system. Since I haven't tried these new steps, I'm just guessing.

Instead of running do-release-upgrade, you'll have to try this:

sudo -i
mkdir /tmp/upgrade-to-gutsy
cd /tmp/upgrade-to-gutsy
wget http://old-releases.ubuntu.com/ubuntu/dists/gutsy/main/dist-upgrader-all/current/gutsy.tar.gz
tar zxf gutsy.tar.gz
./gutsy --help

I'm not sure which should be the best options in your case, but you could try (YMMV):

./gutsy --mode=desktop --frontend=DistUpgradeViewGtk --with-network

The remaining steps would be the same I gave previously.

Hope that helps!