Although if your USC/Unity8 is crashing for some other reason than bug 1536662, I guess you would also see the same broken login screen.
So it really depends: Does it take 30 seconds to return you to the login screen or is it immediate? Please attach these files so we can find out what the cause is: ~/.cache/upstart/unity8.log /var/log/lightdm/unity-system-compositor.log ** This bug is no longer a duplicate of bug 1536662 [regression] Black screen: Mir hangs and then crashes on startup/login due to reading from /dev/random ** Changed in: mir Importance: Undecided => High ** Changed in: unity8 (Ubuntu) Importance: Undecided => High ** Changed in: mir Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity8 in Ubuntu. https://bugs.launchpad.net/bugs/1549455 Title: Unity 8/Mir doesn't load Status in Mir: Incomplete Status in unity8 package in Ubuntu: Incomplete Bug description: This bug Makes the pc UNUSABLE when I try to launch Unity 8 and Mir, after writing the password on the login (in the image attached) the bar to enter the password disappears and my computer screen stays stuck without them let me do anything. the connection begins to separate and reattach alone and I can only move the cursor. it makes the computer unusable and I am forced to restart forced to then enter into Unity 7. represented in the screenshot is the lock status after entering the password. Version: unity8.11+16.04.201602.16.1 Version of Mir : 0.20 To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1549455/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp