There are a lot of changes in Python 3.x. I have not even attempted to make F-Engrave run under Python 3.x.
The safest version to use with F-Engrave is 2.7.
I think making F-Engrave work with Python 3.x make sense so I will push it higher on the list of my things to do.
Russell, I am sorry you are having such trouble getting the program running under Linux. (this type of problem was the genesis of the windows executable version. I am glad that is working for you)
Scorch