It sounds like maybe you hit bug 1765261. That one will be fixed
separately in gnome-shell 3.28.2.
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Packages, which is subscribed to gnome-shell in Ubuntu.
[regression] Password accepted but login fails (blank purple screen
and mouse pointer only)
Status in gdm:
Status in Release Notes for Ubuntu:
Status in gdm3 package in Ubuntu:
Status in gnome-shell package in Ubuntu:
Status in gdm3 source package in Bionic:
Status in gnome-shell source package in Bionic:
[ Description ]
Due to a refcounting bug, a GDBusConnection was getting disposed when
it was still required. The symptom of this was that you couldn't log
in if you'd got your password wrong.
[ Test case ]
1. Boot to GDM
2. Click your username
3. Type the wrong password a couple of times, pressing enter after each time
4. Type the right password
If the bug is happening, after 4. the system hangs at a blank screen
with the mouse cursor. If you then switch to a VT or otherwise connect
to the machine, you can examine the journal and you'll see a
[ Fix ]
Marco and I worked upstream on this fix. We found out that there was a
problem like this-
The GdmClient has a shared GDBusConnection for its operations. The
first time someone calls for it, it is created and stored in the
object's private structure. Subsequent calls return *a new reference*
to this same object. It turned out that the asynchronous method to get
the connection was accidentally unreferencing its object before giving
it to the caller if it was returning an already-existing connection.
For this to work properly, we need to nullify the pointer we stored
when the connection goes away, so we know when to make a new one.
There were some cases where we didn't add the weak references required
to do that. Those are also fixed.
[ Regression potential ]
Now we share connections more than we did before. We also more
carefully track when to clear our object. If we got this wrong, we
might end up leaking the connection or dropping it in even more cases.
[ Original report ]
WORKAROUND: After typing an incorrect password, click Cancel, then click your
name, then enter your password again.
Trying to log into my session (Gnome, Xorg), if I enter the wrong
password before entering it correctly, the session doesn't load and I
get a purple screen, a mouse cursor, and an invisible but clickable
menu in the top right. If I enter it correctly the first time, there
is no problem.
I've replicated this from a fresh boot, after logging out and after
'sudo service gdm restart' from the Ctrl-Alt-F4 console.
This is a fresh install, and didn't occur when I was using a previous
install of 18.04 (until Friday).
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
Date: Sun Apr 22 20:31:13 2018
InstallationDate: Installed on 2018-04-22 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180421.1)
UpgradeStatus: No upgrade log present (probably fresh install)
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