Red Hat Bugzilla – Bug 1280033
GDM doesn't display login screen if multiple users share numeric UID
Last modified: 2016-12-20 10:38:51 EST
Description of problem:
When two users share UID 1001, the next system boot will hang waiting for the Plymouht boot screen to quit, and the GDM login screen will never appear. The fix for this issue is to remove one of the duplicate users.
Version-Release number of selected component (if applicable):
Happens every time.
Steps to Reproduce:
1. Configure two users with UID 1001
2. Reboot system
3. Watch the GDM login screen not appear
GDM login screen doesn't appear, systemd hangs forever waiting for the Plymouth boot screen to quit.
Plymouth boot screen should quit and GDM should appear with valid login options.
Found this issue when attempting to apply a Puppet manifest to a laptop with a fresh installation of Fedora 23. The Puppet manifest was tested using a Fedora 23 Vagrant box. The manifest configures a user as UID 1001, but has to allow duplicates in order to prevent subsequent Vagrant/Puppet configuration from failing due to the 'vagrant' user with UID 1001 being removed or otherwise modified. The manifest configures the 'vagrant' user to be part of the 'ssh' group so 'vagrant ssh' correctly functions.
My fix was to not configure the 'vagrant' user on the laptop, thereby not creating the second user with UID 1001. This user was mistakenly being created anyway; it's useful only in the test environment.
I don't know how big of a problem this issue really is, but I thought it important enough to document so others can hopefully not spend as much time as I did trying to figure out what was going on.
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