I've recreated this by removing linux-generic and not running sudo apt-get remove, so the root cause is the same as bug 1509305. Given that bug 1509305 is more succinct, I'm going to mark this as a duplicate of that.
I've recreated this by removing linux-generic and not running sudo apt-get remove, so the root cause is the same as bug 1509305. Given that bug 1509305 is more succinct, I'm going to mark this as a duplicate of that.