Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? در ubuntu11.10

[amirizadi]

sudo dpkg --configure -a
sudo apt-get -f install
sudo apt-get --fix-missing install
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get clean
sudo apt-get autoremove