Phew, thankfully every so often I was able to access the command line with Ctrl + Alt + F2 without it flashing back to the boot messages (maybe once every twenty times) and then removed the flag from the .desktop file. Took me a couple of hours as it was really erratic behaviour. (The recovery mode didn't help either, same flashing between bootup commands and black screen.)
I won't try that flag again! Any other way I can provide a useful log? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1757068 Title: Night light brakes when screen dims To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1757068/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs