The reason for this, is an issue with `rabbitmq-server`. The shipped configuration lacks some entries pointing to the plugin install dir, or the install dir doesn't exist. To reproduce: ```shell $ docker run -ti debian:trixie bash $ apt update ; apt install -y rabbitmq-server $ rabbitmq-plugins enable rabbitmq_stomp ``` The last command is what `koha-common.postinst` runs then the `koha-common` package is installed/upgraded. Hence the failure This is a `trixie` bug to keep an eye on.
Also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1100165
*** This bug has been marked as a duplicate of bug 39314 ***