I upgraded my laptop to Ubuntu 10.04 this evening. I've been running it on my work laptop for a while and on my desktop in the basement, and it's been great. On both of those computers I did a new install instead of an upgrade.
For the first time ever, I was able to do the upgrade completely over a wireless network. In the past, Ubuntu removed the Broadcom driver I'd installed by hand and refused to replace it. This time I got a message asking if I'd like to install it, and it did. Nice!
But that brings up my major complaint with Ubuntu upgrades. It removed apps that I had specifically installed. It should ask. My Sun JDK was removed and OpenJDK was installed in it's place. xscreensaver was uninstalled, but at least gnome-screensaver was not installed. It'll probably take me a few days to figure out what else is missing.
Another pain with 10.04 is they moved the window buttons to the left. Beats me why, I can't think of a good reason when it's been on the right for literally years. Just to fuck with people, I think. The fix is relatively easy, but not for joe average user:
1. Fire up gconf-editor
2. Drill down to /apps/metacity/general
3. Change the "button_layout" value menu:maximize,minimize,close
That is all.