I know there are a number of us Ubuntu Linux users here, but no catch-all thread.
I upgraded my work laptop (Sager NP 5797) to the 9.10 beta release. I ran into a couple of issues, addressed in these blog posts:
- Upgrade to Karmic: Boot screen flickers, no X, NVIDIA driver
- Upgrade to Karmic: Eclipse/Aptana UI woes
I'm also currently figuring out a fix to a sound problem on this laptop. The Intel HDA sound worked without a hitch on previous Ubuntu releases, but the system does not currently see the hardware (I've read that this is a problem from the upgrade process, as others who have had the issue resolved it with a clean 9.10 install).
There have been some deep changes in this revision, so it's no surprise that there are some transition issues. A clean install may be a good idea if you encounter problems.