I upgraded Pinto, a Thinkpad T60 from Ubuntu 9.10 to 10.04 SLT. The upgrade went almost without a hitch.
The first issue was on the reboot. I can’t blame this on the upgrade, though. Since at least Ubuntu 8,
/boot/grub/menu.lst doesn’t get updated whenever a new kernel is installed. So on reboot, I got the kernel version Ubuntu 9.10 was using. Manually editing
menu.lst fixed that.
After a reboot, the first thing I noticed was middle mouse button scrolling didn’t work. Googling “ubuntu 10.04 middle button scroll” turned up a fix.