I've update my ubuntu from 8.04 to 9.10 and i don't understand why now i got low graphics and i've got problem with some software

Binary package hint: flashplugin-nonfree

because of the fact that the software "mixxx" doesn't find audio device,first i try to uninstall this program without suceed
after i decide to update my system(from ubuntu 8.04 to 9.10) and i had problems with some pakagees and pop out problems with graphics(it's lower than maximum).At now i have problem with the program "mixxx" i can't install o uninstall other software.I've also a broken pakage (adobeflashplayerplugin) and i can't remove it even if i tried

please i'm noob(i'm italian) help me!!!

release of Ubuntu:Ubuntu 9.10 - the Karmic Koala
version of the package you are using:even if i try to know it i didn't suceed

ProblemType: Package
Architecture: i386
Date: Tue Dec 1 22:36:02 2009
DistroRelease: Ubuntu 9.10
ErrorMessage:
 ErrorMessage: pacchetti in conflitto - flashplugin-installer non verrà installato
Package: flashplugin-installer (not installed)
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
SourcePackage: flashplugin-nonfree
Title: package flashplugin-installer (not installed) failed to install/upgrade:
Uname: Linux 2.6.31-15-generic i686