Still, I wanted to take one of the suggestions offered, boot from SD card instead of a vfat partition on my thumb drive, /dev/sdb1. I finally was able to get a copy of kernel 4.20 on the SD card and boot from it. Now I can safely take dmesg's suggestion to fsck /dev/sdb1 without worrying about what some of the options might do to it.
However, I have been inclined to try new kernels as presented. Easy when I was using a thumb drive. I just opened the UBUNTU icon on my desktop and dragged the new partition to it from /bart/Downloads. That doesn't seem to work with the SD card for lack of "permission." To get 4.20 onto it I had to go to the terminal, cd Downloads/ and use this command:
Code: Select all
sudo cp vmlinux-4.20-Amiga*/X5000*/uImage-4.20 /media/bart/91dd8491-ac97-44c7-9611-dcabfec171a3/