Comment 4 for bug 1741468

I've seen something similar in Ubuntu MATE 17.10. We boot the live session a lot at work on various PCs that people bring in, and maybe 1 or 2 out of 10 do something like this. What we get is what is described in this bug, except we get the correct desktop background and NO Welcome. If Welcome loads, it will work OK for us.

*Usually* it will work when we reboot and try again, but sometimes it takes a few tries. I haven't been able to look at it systematically because they are other people's computers. Some have hardware issues like failing HDs, but I've never seen this on earlier versions of Ubuntu. (Due to the firmware bug, we've gone back to 17.04 for now.)