Quando tentei instalar sudo no Debian 8.2 via aptitude install sudo , recebi um erro: No candidate version found for sudo . A lista de fontes é padronizada.
Aqui está a lista de origens:
deb http://httpredir.debian.org/debian jessie main
deb-src http://httpredir.debian.org/debian jessie main
deb http://httpredir.debian.org/debian jessie-updates main
deb-src http://httpredir.debian.org/debian jessie-updates main
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main