There are some things pointing to gdm though far, far from conclusive
1. The current ubuntu-gnome daily image suffers the same
2. I have a usb from June 26 that works fine, it uses lightdm
3. This bug was filed on July 27 but was not immediate to the issue so it's emergence & the move to gdm3 *could* be the same.
If a image could be produced whose only diff is the dm that may be interesting.
There are some things pointing to gdm though far, far from conclusive
1. The current ubuntu-gnome daily image suffers the same
2. I have a usb from June 26 that works fine, it uses lightdm
3. This bug was filed on July 27 but was not immediate to the issue so it's emergence & the move to gdm3 *could* be the same.
If a image could be produced whose only diff is the dm that may be interesting.