This is the first occurence of this problem for me. I've been using 14.04 since the release, but I recently reinstalled Ubuntu. I did not experience this problem with my previous installation of 14.04.
The only difference between my current install and the one where I didn't experience this problem is that I now installed 14.04.2 directly (instead of upgrading to it) and I now use UEFI boot, instead of using Bios compatibility mode (CSM). I have no idea how that would affect the system, but it might be something.
This is the first occurence of this problem for me. I've been using 14.04 since the release, but I recently reinstalled Ubuntu. I did not experience this problem with my previous installation of 14.04.
The only difference between my current install and the one where I didn't experience this problem is that I now installed 14.04.2 directly (instead of upgrading to it) and I now use UEFI boot, instead of using Bios compatibility mode (CSM). I have no idea how that would affect the system, but it might be something.