Você está perdendo os repositórios maverick-updates
e security.ubuntu.com
. Edite /etc/apt/sources.list
e adicione:
deb http://archive.ubuntu.com/ubuntu/ maverick-updates main universe restricted
deb-src http://archive.ubuntu.com/ubuntu/ maverick-updates main universe restricted
deb http://security.ubuntu.com/ubuntu maverick-security main restricted
deb-src http://security.ubuntu.com/ubuntu maverick-security main restricted
deb http://security.ubuntu.com/ubuntu maverick-security universe
deb-src http://security.ubuntu.com/ubuntu maverick-security universe
deb http://security.ubuntu.com/ubuntu maverick-security multiverse
deb-src http://security.ubuntu.com/ubuntu maverick-security multiverse
Atualize sua lista de pacotes e tente novamente:
sudo apt-get update
sudo apt-get install libnss3-dev