Bonjour,
En réponse aux questions de nam1962.
Réponse de la ligne de commande "cat /etc/apt/sources.list"
cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 16.04.3 LTS _Xenial Xerus_ - Release amd64 (20170801)]/ xenial main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ xenial main restricted
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ xenial universe
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial universe
deb http://fr.archive.ubuntu.com/ubuntu/ xenial-updates universe
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://fr.archive.ubuntu.com/ubuntu/ xenial multiverse
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu xenial partner
# deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://security.ubuntu.com/ubuntu xenial-security main restricted
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://security.ubuntu.com/ubuntu xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://security.ubuntu.com/ubuntu xenial-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
Réponse à la deuxième ligne de commande "cat /etc/apt/sources/list.d/*.list"
cat /etc/apt/sources/list.d/*.list
cat: '/etc/apt/sources/list.d/*.list': Aucun fichier ou dossier de ce type
Les comptes de messagerie sont en IMAP.
Pour ce qui est de la sauvegarde dans l' année en cours, je suis partagé sur ce type de solution.
Elle correspond effectivement à un minimum de logique bien que reprendre la sauvegarde pour la remettre dans un sous dossier ne me parait pas très élégant informatiquement parlant.
D' autre part, cette deuxième solution ne fonctionne pas car Thunderbird refuse de déplacer le fichier.
merci de vos interventions.