3.2.0.beta4 a échoué à la compilation -- Site hors service

[merefield (Robert)]

OK so I think rbtrace may be relying on the modernity of the background OS for some reason, see this advice:

Discourse Build Error: “An error occurred while installing rbtrace (0.5.1), and Bundler cannot continue

Debian 9 has been superseded by Debian 10 (“buster”). Security updates have been discontinued as of July 6th, 2020. You may want to take your backup and migrate to a new server running a current OS version.

So it looks like advice is to migrate to new server to expedite OS upgrade.