I was having problems answering a call in Skype, no answer button, and so I decided to reinstall Skype from scratch.
This is Xubuntu with lsb-release showing
DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"
Ran this morning
sudo apt-get autoremove --purge skypeforlinux
Get Skype from https://www.skype.com/en/get-skype/
sudo apt install ./skypeforlinux-64.deb
Started Skype from the menu.
Obtained the Skype window outline but no body, just what was showing under where the body should be. It just hangs there and I have to kill the pid to close it.