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Quantum GIS 1.8

Adicionar ao Repositório
# vim /etc/apt/sources.list

# PACOTES
deb http://qgis.org/debian lucid main
deb-src http://qgis.org/debian lucid main
#DEPENDENCIAS
#add-apt-repository ppa:ubuntugis/ubuntugis-unstable
deb http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu oneiric main
deb-src http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu oneiric main

Limpar a lista de repositórios antigos
# apt-get clean

Atualizar a nova lista de repositórios
# apt-get update

Adicionar a chave "repository public key"
# KEY=5CA44993 ; gpg --keyserver subkeys.pgp.net --recv $KEY ; gpg --export --armor $KEY | sudo apt-key add -
# KEY=314DF160 ; gpg --keyserver subkeys.pgp.net --recv $KEY ; gpg --export --armor $KEY | sudo apt-key add -
# KEY=7B0FB2CA ; gpg --keyserver subkeys.pgp.net --recv $KEY ; gpg --export --armor $KEY | sudo apt-key add -
# KEY=46D7E7CF ; gpg --keyserver subkeys.pgp.net --recv $KEY ; gpg --export --armor $KEY | sudo apt-key add -


Atualizar novamente o repositórios
# apt-get clean
# apt-get update


Para instalar o Quantum GIS, use o comando
# apt-get install python-software-properties
# apt-get install qgis

FUENTE http://hudsonss.blogspot.com/2012/03/quantum-gis-174-no-ubuntu-1110.html