Since 9.10 I have had very few issues, Ubuntu has worked well on my Samsung NC10. However, the new (2.6.39+) samsung_laptop kernel module causes serious backlight flickering and makes the desktop unusable. Bug report. This bug occurs when the laptop is running on battery power only.
Luckily Voria has a PPA repository that solves a variety of Samsung Ubuntu problems. Instructions on how to use the repository and apply a backlight fix can be found here. Although these instructions are for a previous version of Ubuntu they work fine for 11.10. It does say that if you are using BIOS 11CA then the backlight fix is not needed. However, this is not the case, the fix is needed and works fine. Thank you Voria!
I recommend that all Samsung Ubuntu users look at Voria’s forum.
Anyhow, now that the flickering has stopped I’m enjoying using Ubuntu on my NC10 again.