Having trouble getting started

i tried getting started using a vagrant container, i used the one from the documentation just

A) modified it to ubuntu 18.04
b) had the vagrant file not download the rocketchat release

instead after that i continued with the developer getting started by clowining rocketchat and doing
meteor npm install
which fails cause it says .meteor already exists but there is no .meteor/meteor executable

if i instead delete the whole .meteor folder it installs but then meteor npm start fails with
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! Rocket.Chat@1.2.0-develop start: meteor

(not sure which part of the log that is created to paste, here are 3 lines that might indicate where the error starts

14 verbose stack Error: Rocket.Chat@1.2.0-develop start: meteor
14 verbose stack Exit status 1
14 verbose stack at EventEmitter. (/var/www/Rocket.Chat/.meteor/packages/meteor-tool/.1.8.1.ani1yi.p0f9s++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:301:16)
14 verbose stack at emitTwo (events.js:126:13)
)