@9a4db - Djani,
Look at this posting -----> LimeSDR installation from source
While this may be for a later version of Ubuntu, the sequence won’t be much different. I have a post on this and will add that as soon as I come across it (it was for Ubuntu 16.04)…Standby for more…
EDIT: Here is that link and it was for Ubuntu 16.04 ----> LimeSDR with Gqrx is working!
73 de Marty, KN0CK