I have damaged jack input and my system thinks I have headphones plugged in. On a Windows machine I was able to manually switch from headphones to speakers permanently.
How i can do this in Ubuntu ?
You can try asking pulseaudio to select a different port for the sink (sink is pulseaudio parlance for something where audio "goes").
I suggest you install
This could potentially be automated by adding a short script with pactl to your startup programs list, the script would do something like: