As already described on Github we have the problem, that apt can’t download the release file from packager.io of the Stable Version of Zammad for Debian 9:
https://github.com/zammad/zammad/issues/3153
I just noticed, that I have some simillar issues with Ubuntu righ now.
error:5 https://dl.packager.io/srv/deb/zammad/zammad/stable/ubuntu 18.04 InRelease
500 Internal Server Error [IP: 178.63.71.248 443]
I’m afraid that I still can’t repdouce that.
I tested this on a clean fresh install and an existing system - no issues.
If that issue still exists, it may be a local issue in your environment we can’t help you with.
Seems like this was a temporary issue on packager.io side.
I just installed a Ubuntu machine to ensure that.
Please try again.
thank you very much, yes it seems to be, that it was a temporary thing at packager.io. Now I’m able to upgrade zammad once again 
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