Hi Ben and All,
I have to run F 3 on Mint because I can't get the dependencies all lined up for Ubuntu 16.04. It's incredibly difficult, to the point that I had given up and I run a Mint VM just for F 3.
Now that others are also having problems, perhaps I will look into this again. As to what the differences in environment are between Mint and Ubuntu are that affect this, I just don't know. But I will find out for us all.