Problems to install in Ubuntu 16.04

Hi,

I'm trying to install appy without docker. I can install the backend and it is working. However, the frontend has problems installing geckodriver using 'npm install' or 'sudo npm install'.

I found in some blogs different ways to install it like:
`sudo npm i -g geckodriver --unsafe-perm=true --allow-root`
or
`sudo yarn add geckodriver`

both install succesfully the geckodriver, but when I start the frontend or when I run again 'npm install' I got the same initial error

> geckodriver@1.11.0 postinstall /home/aburbanol/dev/WebApps/appy/frontend/node_modules/geckodriver
> > node index.js
>
> Downloading geckodriver... events.js:183
> throw er; // Unhandled 'error' event
> ^
>
> Error: EACCES: permission denied, open 'geckodriver.tar.gz'
> npm WARN eslint-config-prettier-standard@2.0.0 requires a peer of eslint-config-standard@^11.0.0 but none is installed. You must install peer dependencies yourself.
> npm WARN nes@6.5.2 requires a peer of hapi@>=13.0.0 but none is installed. You must install peer dependencies yourself.
> npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.2 (node_modules/fsevents):
> npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
>
> npm ERR! code ELIFECYCLE
> npm ERR! errno 1
> npm ERR! geckodriver@1.11.0 postinstall: `node index.js`
> npm ERR! Exit status 1
> npm ERR!
> npm ERR! Failed at the geckodriver@1.11.0 postinstall 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/aburbanol/.npm/_logs/2018-07-05T12_13_20_368Z-debug.log