Instale o parceiro do Y PPA Manager, é realmente intuitivo: link
Depois de fazer uma atualização, agora estou executando o Ubuntu 12.04 LTS, conforme indicado abaixo
> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
No entanto, acho que todas as entradas em meu /etc/apt/sources.list foram comentadas, exceto por uma.
PERGUNTA: É seguro para mim editá-los, substituindo o antigo 'lúcido' por 'preciso' no que é mostrado abaixo?
## unixteam source list
# deb http://debian.yorku.ca/ubuntu/ precise main main/debian-installer restricted restricted/debian-installer # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu/ precise main restricted # disabled on upgrade to precise
# deb http://debian.yorku.ca/ubuntu/ lucid-updates main restricted # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu/ lucid-updates main restricted # disabled on upgrade to precise
# deb http://debian.yorku.ca/ubuntu/ precise universe # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu/ precise universe # disabled on upgrade to precise
# deb http://debian.yorku.ca/ubuntu/ precise multiverse # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu/ precise multiverse # disabled on upgrade to precise
# deb http://debian.yorku.ca/ubuntu lucid-security main restricted # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu lucid-security main restricted # disabled on upgrade to precise
# deb http://debian.yorku.ca/ubuntu lucid-security universe # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu lucid-security universe # disabled on upgrade to precise
# deb http://debian.yorku.ca/ubuntu lucid-security multiverse # disabled on upgrade to precise
# deb-src http://debian.yorku.ca/ubuntu lucid-security multiverse # disabled on upgrade to precise
# R sources
# see http://cran.us.r-project.org/bin/linux/ubuntu/ for details
# deb http://probability.ca/cran/bin/linux/ubuntu lucid/ # disabled on upgrade to precise
deb http://archive.ubuntu.com/ubuntu precise main multiverse universe
Verifique se as fontes realmente suportam precise
Eu verifiquei esta fonte [ link ] e há uma pasta precise , então renomear as fontes para precise deve funcionar bem. Embora em fontes marcadas como lucid-security você queira alterá-las para precise-security .