I did a bit more digging around. I had a look at the greeter log file.
I have attached the greeter log file with this comment.
sudo less /var/log/lightdm/x-0-greeter.log
I noticed these lines:
[+0.58s] DEBUG: background.vala:67: Making background
/home/mendhak/Pictures/Wallpapers/General/sunset_texture.jpg at 1440x900
[+0.58s] DEBUG: background.vala:144: Error loading background: Failed to open
file '/home/mendhak/Pictures/Wallpapers/General/sunset_texture.jpg': Permission
denied
[+0.58s] DEBUG: background.vala:116: Render of background
/home/mendhak/Pictures/Wallpapers/General/sunset_texture.jpg complete
[+0.58s] CRITICAL: background_loader_create_pattern: assertion `image != NULL'
failed
That's a wallpaper in my own wallpaper collection. It is trying to
access it and failing. On a hunch, I went in and used one of the
regular/supplied wallpapers that came with Ubuntu (right click Desktop,
change desktop wallpaper). That worked!
I then tried to set a custom wallpaper again after doing a chmod 0777 on
the entire wallpaper directory. That still didn't work, the log file
still mentions permission denied. I am not sure what kind of
permissions I should be setting on my Wallpapers folder.
***tl;dr: Use one of the default Ubuntu wallpapers***
** Attachment added: "Greeter log file"
https://bugs.launchpad.net/ubuntu/+bug/973993/+attachment/3114038/+files/greeterlog.txt
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https://bugs.launchpad.net/bugs/973993
Title:
lightdm - can't log in - it hangs after entering password - "Logging
in"
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