I'm friends with a dev I respect that recently took a job on the Skype team. Skype is completely broken everywhere, because the code is a nightmare and people are scared to make changes - any change will break something. Linux is probably just low priority on a very long list of things that are terrible/broken about Skype.
I was about to say the same thing, is there any platform Skype is actually reliable ? I had problems with Linux, Windows and Android.
Hmm--I've had no trouble with Skype on Ubuntu 14.04 or 16.04. I only use it every few weeks, though.