Topic: Repository no longer signed
IredAdmin : 0.9.8
Nginx
Mysql
Debian 9.5
Hello, i have a problem on a fresh install,
When i do an update like that, the shell reports this :
# apt-get update
Hit:1 http://security.debian.org stretch/updates InRelease
Ign:2 http://deb.debian.org/debian stretch InRelease
Hit:3 http://deb.debian.org/debian stretch-updates InRelease
Hit:4 http://deb.debian.org/debian stretch Release
Hit:5 https://packages.inverse.ca/SOGo/nightly/4/debian stretch InRelease
Ign:7 https://dl.packager.io/srv/deb/zammad/z … ble/debian 9 InRelease
Ign:9 https://dl.packager.io/srv/deb/zammad/z … ble/debian 9 Release.gpg
Reading package lists... Done
E: The repository 'https://dl.packager.io/srv/deb/zammad/zammad/stable/debian 9 Release' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
I don't arrive to solve this problem, cause i don't find zammad for upgrading the key..
I would like to make an upgrade with wget of the key, so i ask you how to do that correctly 
Thanks 
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