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linuxpermissions

On Linux, unpackerr runs as user:group unpackerr:unpackerr. You will need to give that user or group read and write access to your archives. That may mean adding the unpackerr user, for example, to the debian-transmission group. You would do that with a command such as sudo usermod -aG debian-transmission unpackerr

It's only suggested you do run usermod if you know what it does and how to set a umask. You probably instead want to change the uid and/or gid as shown next.

Change the uid/gid​

If you wish to change the user and/or group that unpackerr runs as you need to do exactly this, and only this:

  1. Run this command:
    • sudo systemctl edit unpackerr.service
  2. The previous command opens your $EDITOR with a commented out version of the unpackerr service unit.
  3. Add the following content to the file editor between the comments. Replace newuser and newgroup with your new values. 
    [Service]
    User=newuser
    Group=newgroup
  4. Run this to read the new systemd service override file:
    • sudo systemctl daemon-reload
  5. Run this to start unpackerr with the new user and group:
    • sudo systemctl restart unpackerr