Do you experience problems during downloading?
Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
We will probably ask you to do a test using only basic settings.
Do you experience problems during repair or unpacking?
Enable +Debug logging in the Status and Interface settings window and share the relevant parts of the log here using [ code ] sections.
I am running Ubuntu server 12.04.2 on a headless machine with sabnzbdplus from the apt-get repo (version 0.6.15). I have it set to run as a daemon through the /etc/init.d script. In the /etc/default/sabnzbdplus file, I have it set to run as a user (not root). I also set the host to the local IP address of the box and set the port to 8080. After I ssh in to the machine and start it with