O que posso fazer quando meu gerenciador de pacotes de atualização lança isso para mim?
Error authenticating some packages. Continue?
It was not possible to authenticate some packages. This may be a transient network problem. You may want to try again later. See below for a list of unauthenticated packages.
xserver-xorg-video-savage
EDIT: tentando os seguintes comandos sudo apt-get update && sudo apt-get upgrade
[...]
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG 0F678A01569113AE Launchpad Caffeine
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B22AB97AF1CDFA9
Reading package lists... Done
[...]