If you want it, then get it. 
http://qoe6rdttrncugsow.myfritz.net/bike/public/raspberrypi-ubuntu-rpi3Bplus/
I had create any “Homebrew” preinstalled Images , they runs on Raspberry Pi2 / 3 / 3B+
I had use the Update-Assistant (packagemanagement) .Kernel ist updated to 4.14.77
Ludger
Thanks for that.
I note that the default login is pi/raspberry as in Raspbian,
and that ethernet works by default, but not wifi.
I found no UK/GB keyboard in the localisation, so had to guess what the german keyboard gives. I think australia would be OK, but it didn’t reboot to let me have it
I’ve now changed my installation (so I can comprehend the menu labels) with the help of:
this page
Derek