I filled bug 438977 by mistake, sorry for the duplicate. But I can confirm that it worked for me to change to a text VT, then stop gdm and retry the upgrade. It worked on both of my computers.
I filled bug 438977 by mistake, sorry for the duplicate.
But I can confirm that it worked for me to change to a text VT, then stop gdm and retry the upgrade. It worked on both of my computers.