Galera consegui resolver o problema em partes.
Eu tinha instalado o ambiente do mint, Mate, no ubuntu, parando pra pensar começou a dar problemas depois que instalaei nele.
Consegui a solução procurando no Ask Ubuntu
http://askubuntu.com/questions/81263/how-to-i-fix-software-center-after-installing-the-linux-mint-mate-desktopI had the same problem with Software Center and some other apps. However, you don't need to do a reinstall though that's probably advice too late. Here's why it doesn't work:
lsb_release -a prints:
Distributor ID: LinuxMint Description: Linux Mint 12 Fluxbox Release: 12 Codename: lisa
and that can be corrected to keep Mint-Mate by doing this:
gksu gedit /etc/*release
and change everything in the file gedit brings up to:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=Oneric
DISTRIB_DESCRIPTION="Ubuntu 11.10"
Then run:
gksu gedit /etc/*issue
and change to:
Ubuntu 11.10 \n \l
Worked great for me though Mate seems a bit rough around the edges but as I am purely testing Oneric in VBox it's no matter
Porém agora, ele só carrega, mas estou pesquisando e o problema parece ser mais fácil, vamos ver.
Obrigado.