cat /etc/apt/preferences
Package: *
Pin: release a=gutsy-backports
Pin-Priority: 400

cat /etc/apt/apt.conf
Acquire::http::Proxy "http://x.x.x.x:y/";

apt-get
apt-cache
dpkg-reconfigure

sudo apt-get install -t gutsy-backports openarena
sudo apt-get upgrade -u -t gutsy-backports

/etc/enviroment
export LANG=sk_SK
export LC_CTYPE="sk_SK"
export LC_NUMERIC="sk_SK"
export LC_TIME="sk_SK"
export LC_COLLATE="sk_SK"
export LC_MONETARY="sk_SK"
export LC_MESSAGES=C
export LC_PAPER="sk_SK"
export LC_NAME="sk_SK"
export LC_ADDRESS="sk_SK"
export LC_TELEPHONE="sk_SK"
export LC_MEASUREMENT="sk_SK"
export LC_IDENTIFICATION="sk_SK"
export LC_ALL=

/etc/default/locale
#LANG="en_US.UTF-8"

locale-gen sk_SK
locale-gen en_US

apt-key adv --recv-keys --keyserver keyserver.ubuntu.com XYZ