Matrix Synapse - instalation error

Problem Description
I get this error message when I try to install Matrix Synapse
“Error installing app: Command ‘[‘sudo’, ‘–non-interactive’, ‘–close-from’, ‘20’, ‘/usr/share/plinth/actions/actions’, ‘plinth’, ‘install’, ‘–write-fd’, ‘19’]’ died with <Signals.SIGTERM: 15>.”

Steps to Reproduce

  1. (Login to FreedomBox.)
  2. (Go to Matrix Synapse application page.)
  3. (Click on the install button.)

Expected Results
(I expected to see a message confirming the instalation were succesfull.)

Actual results
(I get an error with the following message:)

Error installing app: Command ‘[‘sudo’, ‘–non-interactive’, ‘–close-from’, ‘20’, ‘/usr/share/plinth/actions/actions’, ‘plinth’, ‘install’, ‘–write-fd’, ‘19’]’ died with <Signals.SIGTERM: 15>.



  • FreedomBox version: 23.5
  • Hardware: Hetzner, Debian 11, clean installation
  • How did you install FreedomBox?: according to official instructions

Some quick questions:

  • Space on the drive?
  • Logged in as a user with perms to install software?
  • Are any of those notifications on the bell errors?
  • Do the Cockpit logs show anything more? (you can probably filter on error and above or warning and above)