This seems out of date as I cannot find "bum" nor "boot-up manager" on my Ubuntu Server 20.04.03 installation via either Synaptic or command line.Next we want to change the start order of Squeezebox Server and MusicIP to ensure that MusicIP starts before Squeezebox Server. For this we'll use a graphical BootUp-Manager called bum.
So, from within the Ubuntu GUI go to System -> Administration and choose Synaptic Package Manager, type bum in the Quick Search box and then place a check against bum in the lists of results returned and click Mark For Installation. Choose the additional packages too.
Now launch the BootUp-Manager (System -> Administration -> BootUp-Manager), check the Advanced box and then click on the Services tab. Scroll down to Squeezeboxserver and note the Run levels (by default these are K20, S20, S20 etc). Now scroll to mmserver, place a check against it and then right-click on it and select Change start/stop priority. Change the value to a number to be one below that of Squeezeboxserver. So, by default you'd type 19 in both the Startup Priority: and Shutdown Priority: boxes. Then click OK.
Now restart the server (type sudo reboot -h n
Unless you know how to get at it.... Thanks.