Re: SDRangel install from source - kubunto 18.10
If you can't get it right you may try to build a Docker image with https://github.com/f4exb/sdrangel-docker This is going to be the standard way of building from source more sooner than later (just need to exercise it a bit more). If you insist on building from the terminal you can inspect the Dockerfile in sdrangel directory where you will find the exact proven steps that are taken to build from source. Another advantage of Docker is isolation so there is no chance of interfering with gnuradio or the LimeSuite that lives on your host system.
Also it is much easier for me to spot issues if everyone uses the exact same build recipe. You say you get modules0.8 instead of modules0.7 this is probably because you did not check out the same commit. And ending with "error 2" just tells nothing.