N: ignoring file 'pgdg.list.org' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extensionE: could not open lock file /var/lib/dpkg/lock-frontend -open (2: No such file or directory)E: unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend)nous avons essayé de faire apt-get update et c'est bloqué sa refuser de redémarrer