The 'All' designation does make a port on Unifi switches a trunk port but it also allows access (aka untagged) traffic and it's more like a hybrid port. Herein lies one of the conumdrums with Unifi switches. Port 8080 is used by other programs Start-up failed.
I googled this issue and in most sources I've read it seems that java is using port 8080 and the most straight forward solution is to end task the java process tree. Can't start UniFi Controller - port 8080 used by other programs Okay, so this is kind of a messed up one.