# Configure sources.list
cat >$mnt/etc/apt/sources.list <<EOL
deb [arch=amd64] http://ftp.de.debian.org/debian/ testing main contrib non-free
deb-src [arch=amd64] http://ftp.de.debian.org/debian/ testing main contrib non-free
deb [arch=amd64] http://ftp.de.debian.org/debian/ testing-updates main contrib non-free
deb-src [arch=amd64] http://ftp.de.debian.org/debian/ testing-updates main contrib non-free
deb [arch=amd64] http://security.debian.org/ testing/updates main contrib non-free
deb-src [arch=amd64] http://security.debian.org/ testing/updates main contrib non-free
EOL