Forum Linux.débutant erreur update

Bonjour,

j'ai une erreur quand j'essaye de faire un update sur mon Raspberry Pi (sur lequel j'ai installé yunohost) :

Unable to update the cache of APT (Debian's package manager). Here is a dump of the sources.list lines which might help to identify problematic lines :
sources.list:deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
sources.list.d/weechat.list:deb https://weechat.org/raspbian stretch main
sources.list.d/weechat.list:deb-src https://weechat.org/raspbian stretch main
sources.list.d/weechat.list:deb-src https://weechat.org/raspbian stretch main
sources.list.d/raspi.list:deb http://archive.raspberrypi.org/debian/ stretch main ui
sources.list.d/yunohost.list:deb http://forge.yunohost.org/debian/ stretch stable
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/weechat.list:2 and /etc/apt/sources.list.d/weechat.list:3
E: The repository 'https://weechat.org/raspbian stretch InRelease' is not signed.
W: GPG error: https://weechat.org/raspbian stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D1820DB22A11534E

Je pense que c'est parceque j'ai ajouté ceci pour installer weechat :

GPG key
Import the gpg key used to sign the repository:
$ sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 11E9DE8848F2B65222AA75B8D1820DB22A11534E
Important: the Raspbian repositories are NOT signed.

Faut-il désinstaller la clé GPG et si oui comment ?

Merci.