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[The Unknown <1480595@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I have had a rather odd experience with the "Login as another user"
button on the login screen. At first if I pressed it the screen would go
black (except for a little underscore in the top left hand corner which
was not flashing like in the classic Terminal), and then after a while
come back grey and tell me that another application was blocking the
lock screen (or something like that), and the only way to get back to
the login screen (this could be also the locked screen) would be to
change to a tty and then back again (for instance change to tty1, and
then do "CTRL + ALT + F7" to get back).

Then when I pressed it today it did something different, the screen went
black as it did before, but nothing I did would bring the login screen
back (it was a locked screen and it should ask me for my password before
logging me in again). So I went and logged into tty1, and then I typed
"exit" to get back out, and it switched to a black screen again, then I
tried going to tty1 again, but still black, and I could not return
anywhere, then I tried going to tty2, it was a brand new session (I
don't know if the other session was still running or whether it had been
killed), and it had logged me in there without prompting for a password,
which if successfully reproduced (which I haven't been able to do so far
as I restarted my machine after I couldn't get back to my old session,
or even figure out if it existed still), would be quite a major security
bug.

After my restart I tried to reproduce the bug which logged me in,
however I was unable to, although there were a lot of errors in syslog.
But now when I go and click on the "Login as another user" button on the
login or locked screen, what happens is that the screen goes black, and
then I have to switch to another tty, and then back again to not get a
black screen, but after this when I click the "Login as another user"
button I get the login screen, with the Gnome logo at the bottom, but
nothing else other than the top bar, just grey...

I know that this report may not be that helpful, as I can't reproduce
everything, and it is rather long with a lot of issues, however I
thought it good to report all that has happened so far so at least you
know that these issues are happening.

I am running Ubuntu 15.04, with Gnome Shell, and Gnome 3.14.

---

OS Information:

    No LSB modules are available.
    Distributor ID:	Ubuntu
    Description:	Ubuntu 15.04
    Release:	15.04
    Codename:	vivid

Package Information:

- GDM:

    gdm:
      Installed: 3.14.1-0ubuntu3
      Candidate: 3.14.1-0ubuntu3
      Version table:
     *** 3.14.1-0ubuntu3 0
            500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
            100 /var/lib/dpkg/status

- Gnome Shell:

    gnome-shell:
      Installed: 3.14.4-0ubuntu1
      Candidate: 3.14.4-0ubuntu1
      Version table:
     *** 3.14.4-0ubuntu1 0
            500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
            100 /var/lib/dpkg/status

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New

** Affects: gdm (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: gnome-shell (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gdm (Ubuntu)
   Importance: Undecided
       Status: New

-- 
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https://bugs.launchpad.net/bugs/1480595

Title:
  "Login as another user" button having very odd results

Status in Ubuntu GNOME:
  New
Status in gdm package in Ubuntu:
  New
Status in gnome-shell package in Ubuntu:
  New

Bug description:
  I have had a rather odd experience with the "Login as another user"
  button on the login screen. At first if I pressed it the screen would
  go black (except for a little underscore in the top left hand corner
  which was not flashing like in the classic Terminal), and then after a
  while come back grey and tell me that another application was blocking
  the lock screen (or something like that), and the only way to get back
  to the login screen (this could be also the locked screen) would be to
  change to a tty and then back again (for instance change to tty1, and
  then do "CTRL + ALT + F7" to get back).

  Then when I pressed it today it did something different, the screen
  went black as it did before, but nothing I did would bring the login
  screen back (it was a locked screen and it should ask me for my
  password before logging me in again). So I went and logged into tty1,
  and then I typed "exit" to get back out, and it switched to a black
  screen again, then I tried going to tty1 again, but still black, and I
  could not return anywhere, then I tried going to tty2, it was a brand
  new session (I don't know if the other session was still running or
  whether it had been killed), and it had logged me in there without
  prompting for a password, which if successfully reproduced (which I
  haven't been able to do so far as I restarted my machine after I
  couldn't get back to my old session, or even figure out if it existed
  still), would be quite a major security bug.

  After my restart I tried to reproduce the bug which logged me in,
  however I was unable to, although there were a lot of errors in
  syslog. But now when I go and click on the "Login as another user"
  button on the login or locked screen, what happens is that the screen
  goes black, and then I have to switch to another tty, and then back
  again to not get a black screen, but after this when I click the
  "Login as another user" button I get the login screen, with the Gnome
  logo at the bottom, but nothing else other than the top bar, just
  grey...

  I know that this report may not be that helpful, as I can't reproduce
  everything, and it is rather long with a lot of issues, however I
  thought it good to report all that has happened so far so at least you
  know that these issues are happening.

  I am running Ubuntu 15.04, with Gnome Shell, and Gnome 3.14.

  ---

  OS Information:

      No LSB modules are available.
      Distributor ID:	Ubuntu
      Description:	Ubuntu 15.04
      Release:	15.04
      Codename:	vivid

  Package Information:

  - GDM:

      gdm:
        Installed: 3.14.1-0ubuntu3
        Candidate: 3.14.1-0ubuntu3
        Version table:
       *** 3.14.1-0ubuntu3 0
              500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
              100 /var/lib/dpkg/status

  - Gnome Shell:

      gnome-shell:
        Installed: 3.14.4-0ubuntu1
        Candidate: 3.14.4-0ubuntu1
        Version table:
       *** 3.14.4-0ubuntu1 0
              500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
              100 /var/lib/dpkg/status

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