Not on first login but on switch user after entering correct password I
get purple screen and mouse.

Sometimes after a long delay I can get back to the login screen.  I can
usually force it back to the login screen by hitting a few random cycles
of ctl+alt + F1, ctl+alt F2 and ctl+alt + F3.

At this point, if I click on the the user that failed it shows a message
about authorization problem (but the password was correct).  At login of
this user it then allows access.

I know on subsequent logins it is going to fail as soon as I see the
purple screen.  If I see initial black, I know it is going to work OK.

I noticed this issue on an initial clean build on erased disks.
Concerned about my hardware, I rebuilt again from clean and the problem
is the same.  I do not have a graphics card.  I have: Intel® Core™
i7-4790 CPU @ 3.60GHz × 8.  Ram = 24g.

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https://bugs.launchpad.net/bugs/1766137

Title:
  [regression] Password accepted but login fails (blank purple screen
  and mouse pointer only)

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