the text version of UKUU tells me the installed kernels:
Found installed: 4.15.0-42.45~16.04.1
Found installed: 4.13.0-45.50~16.04.1
Found installed: 4.15.0-38.41~16.04.1
Found installed: 4.15.0-39.42~16.04.1
Found installed: 4.15.0-32.35~16.04.1
Found installed: 4.15.0-29.31~16.04.1
Found installed: 4.15.0-36.39~16.04.1
Found installed: 4.10.0-38.42~16.04.1

uname says the kernel I run now:
4.15.0-39.42

I assume that means one of the kernels smaller than the one I currently run
is what I was running before. Which . I think I need to go back to the
previous stable version. Which do you think it was?