Sempre que digito os comandos sudo apt-get update; sudo apt-get upgrade , mostra:
(You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
libpam-systemd : Depends: systemd (= 229-4ubuntu12) but 229-4ubuntu4 is installed
E: Unmet dependencies. Try using -f.)
e depois disso, quando eu inseri sudo apt-get -f install , aparece:
(E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?)
O que eu faço a seguir? Não consigo atualizar meu pc. Eu também quero instalar o Windows XP ao lado.