I downloaded the vector graphics program called Vectr today and when I double clicked on it to run it nothing happened.

Then I tried to run it from the command line by typing:

./vectr 

... and I saw this error:

./vectr: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory

The easy solution to that problem was to install the required libgconf-2.so.4 library and I did that by running the following command to install it with apt:

sudo apt-get install libgconf-2-4

That's all that was needed to fix the problem. And Vectr seems like a really cool vector graphics drawing program.