Things To Fix / Tweak After Installing Ubuntu 9.10 Karmic Koala

Everybody posts about applications to install after upgrading to Ubuntu 9.10 Karmic Koala. That's interesting, and some applications in those posts are quite useful. But those are just lists of applications like any other "Top 10 Ubuntu applications" list.

I'm not saying they are not interesting, I'll even post some links to such posts from other blogs (look at the bottom of the post) I really liked, but to get there, you must firstly fix everything that's not working for you, tweak some things and so on.