npm install errors

node -v
v10.5.0

npm -v
6.1.0

electron -v
v1.4.13

4 warnings and 3 errors generated.
make: *** [Release/obj.target/leveldown/src/batch.o] Error 1
prebuild ERR! build error
prebuild ERR! stack Error: `make` failed with exit code: 2
prebuild ERR! stack     at ChildProcess.onExit 
prebuild ERR! stack     at ChildProcess.emit (events.js:182:13)
prebuild ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:237:12)
prebuild ERR! not ok
prebuild ERR! build Error: `make` failed with exit code: 2
prebuild ERR! build     at ChildProcess.onExit
prebuild ERR! build     at ChildProcess.emit (events.js:182:13)
prebuild ERR! build     at Process.ChildProcess._handle.onexit (internal/child_process.js:237:12)

> neuron@2.0.2 postinstall /Neuron
> bash postinstall.sh && mv .env.sample .env

postinstall.sh: line 4: cd: node_modules/leveldown: No such file or directory
postinstall.sh: line 6: ../.bin/node-gyp: No such file or directory
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! neuron@2.0.2 postinstall: `bash postinstall.sh && mv .env.sample .env`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the neuron@2.0.2 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.