That doesn't seem to be [a command from an Ubuntu package](http://packages.ubuntu.com/search?suite=yakkety&arch=any&mode=exactfilename&searchon=contents&keywords=sgnonpluginprocess). Did you install anything from source, or without using `apt-get`, the Software Centre, etc.?
– muruFeb 02 '17 at 11:13
yes, several, but this issue just appeared after a recent dist-upgrade. I have installed veracrypt by source, maybe here lies the issue?
– mffmFeb 02 '17 at 11:15