GPG error, Error in discourse-setup command

I’m trying to setup on a virtual server with Plesk Panel installed. Could you help?


Failed to find docker or on your PATH.
Enter to install Docker from or Ctrl+C to exit
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 20009  100 20009    0     0   219k      0 --:--:-- --:--:-- --:--:--  219k
# Executing docker install script, commit: b2e29ef7a9a89840d2333637f7d1900a83e7153f
+ sh -c apt-get update -qq >/dev/null
W: GPG error: stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6DC3D600CDEF74BB
E: The repository ' stable InRelease' is not signed.
Still failed to find docker or on your PATH.
Docker install failed. Quitting.

Not much. That’s a very non-standard configuration. You definitely can’t use discourse-setup. And and discourse-setup suggests, you’ll need to install Docker. If you want to install Discourse in plesk, and you didn’t get as far as installing docker, then I think it’ll take you a while.

I’d recommend that you first install Discourse on its own VM to see how it works the easy and supported way, and then, if you want to try to get Discourse to co-exist with Plesk for some reason, you can go about seeing how to change it so that it might co-exist with Plesk. There are topics about running Discourse with other web servers, so they’ll offer some help, but I’m not aware of any that work with Plesk. I have one client whose VM has plesk and we disabled Plesk and let Discourse have all the ports, but every now and again something would happen and Plesk would take over the ports again and stop Discourse from working.

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It looks like you’re running Debian 8. It’s no longer supported, so you’re probably not going to be able to install Docker or anything else.

Debian 8 has been superseded by Debian 9 (stretch). Regular security support updates have been discontinued as of June 17th, 2018.

So you’ll need to spin up a new server before you can do anything. You should move whatever you have running on that server somewhere else ASAP.

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Just to add to the above from Jay, the current Debian release is 11. Stretch (9) was archived when support ended in 2020.

The current LTS (long term support) release is Buster (10) which will be supported into 2024.

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