App No Longer Starting

I cloned this repository and tried to run the app. This is the error output:

npm start

> [email protected] start /home/jonathan/GroupMe
> electron .

/home/jonathan/GroupMe/node_modules/electron/dist/electron: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! [email protected] start: `electron .`
npm ERR! spawn ENOENT
npm ERR! 
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/jonathan/.npm/_logs/2018-08-19T16_13_20_022Z-debug.log

have you tried installing gconf?