I am using Ubuntu 15.10 and recently ran into a problem* that I cured only by going backwards to the Libre Pilot release for 14.04 Ubuntu. I was using the ppa for Ubuntu 15.04+ until I couldn't use it anymore.
*Problem:
the top menu bar in Libre Pilot that shows "FILE" when you put your mouse pointer near the top does not appear. I tried every key stroke and combination I could think of but I could not get a top menu. There is no way to Import, Export, etc. I used the program many times before it failed.
I uninstalled Libre Pilot 15.04+ which require downloading Synaptic, a superior Ubuntu (un)installer tool. The "description missing" detail in the latest release required this, I guess. I reinstalled the 15.04+ version a few times to be sure, re-flashed the board and reloaded the oldest UAV that I have that used a satellite--way before OPLink. But each time the menu bar would not appear. It had been working before...
I have been having a devil of a time with OPlink staying connected. I had it working a few times but since it seems the source of some of my frustrations I removed OPlink, too.
Frustration, hair loss, grouchiness, missing flying time, blah, blah, I wanna fly my toy, bwah! I must go put in a few hours machining some TI to relax.
note to Hank re previous post: if it doesn't recognize the OPlink although plugged in, powered up, and configured properly then the mini-revo won't boot up in that case, too. Awkward--reflash, import, try something else, and pray.