/etc/apt/sources.list:
deb http://us.archive.ubuntu.com/ubuntu/ dapper main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ dapper main restricted

deb http://us.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ dapper-updates main restricted

deb http://us.archive.ubuntu.com/ubuntu/ dapper universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ dapper universe


deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted

apt-get update
apt-get install -f