Created attachment 1177811 [details]
gdm debug log
Description of problem:
GDM seems to start but gets stuck and doesn't actually take control of the display leading to a failure to properly boot
Version-Release number of selected component (if applicable):
Always (on my system, after but not including the first boot when installing Fedora 24)
Steps to Reproduce:
2. Wait forever for a graphical login.
3. Via single user mode or a different console it is possible to troubleshoot.
No graphical login screen
Graphical login screen.
This is from a fresh F24 install. The original boot after installation worked fine, additional boots (after installing additional packages/updates/etc) did not.
By uninstalling Plymouth and pressing <esc> in early startup, it is possible after the gdm failure to ctrl-alt-f2 over, do a text login and startx to get the graphical system working. Both Gnome and XFCE seem to work fine.
setting WaylandEnable=false in /etc/gdm/custom.conf doesn't seem to help
GDM doesn't seem to ever get to the point of opening the X-server --
/var/log/Xorg.0.log doesn't get touched.
'ps' shows both gdm itself and a gdm-session-worker
systemctl status gdm.service shows gdm as running.
I have the cause of this figured out I think.
It camae from having multiple lines in /etc/passwd and /etc/group that had different names but the same uid or gid.
This came about due to merging the new /etc/passwd and /etc/group from the new install with the list from a previous install. Fedora now forces creation of an account on install with no clear way to avoid, and the account created in the F24 install had the same uid and private gid as the one copied from my old F23 install.
(At least on traditional UNIX multiple accounts with different names but the same UID was an occasional practice. I saw it used on IRIX for example to give multiple users root access via their own root accounts, all with uid 0.)
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