ah.. 8080... that's a REST port for LND, either LDK or Alby must also use it...

I think adding a line to lnd.conf should be enough to remedy that though

then restart servicessystemctl --user restart lnd && systemctl --user restart lightning_pub

For testing things on this same machine more generally though, you may want to look into using VMs for isolation. Assuming you've got memory to spare you can boot up full operating systems with virt-manager:

That's actually how I test/dev across OS's/Architectures

If resources are a little more scarce there's also linux containers, sort of like docker in that it's lightweight, but a little easier to use like a VM. Ubuntu actually maintains the tooling for these: