Comment 65 for bug 1309578

Workaround! For noobs like me, who just need to get the thing to work and don't want to root around obscure system settings, this did the trick: reverting to the Saucy Salamander kernel.

apt-get install linux-image-generic-lts-saucy

... assuming it's in the cache after an upgrade, should be simple.

All the new features in 14.04 seem to work, just stops the eternal restart process.