After the upgrade yesterday on boot I only have a console login. This link shows that gdm is running and has been: https://pastebin.com/UvpNmsSw
Here is the link to my dmesg log https://pastebin.com/EhbmQB5C
I'm running kernel 4.4.0-31-generic dated 13 July.
I've just noticed that my Xorg.0.log is a mess. Its timestamp is 6pm today https://pastebin.com/R7xeQf3w
Link to Xorg log after upgrade yesterday https://pastebin.com/c9DUXzuk
I'd be happy to supply any other files or logs. This is really bugging me.
Try these: