Cannot get rid from this crash Ionic 4 + Firebase

Im starting on a Ionic 4 tutorial and I’m getting this big crash dont know why, i’m cleaning cache, removing /node_modules, installing npm --unsafe-perm… but cannot get rid from this error, thank you so much anyway

manel@XXX:~/Ionic4Tutorial/app$ sudo npm i

> grpc@1.18.0 install /home/manel/Ionic4Tutorial/app/node_modules/grpc
> node-pre-gyp install --fallback-to-build --library=static_library

node-pre-gyp WARN Using request for node-pre-gyp https download
[grpc] Success: "/home/manel/Ionic4Tutorial/app/node_modules/grpc/src/node/extension_binary/node-v67-linux-x64-glibc/grpc_node.node" is installed via remote

> node-sass@4.10.0 install /home/manel/Ionic4Tutorial/app/node_modules/node-sass
> node scripts/install.js

Unable to save binary /home/manel/Ionic4Tutorial/app/node_modules/node-sass/vendor/linux-x64-67 : { Error: EACCES: permission denied, mkdir '/home/manel/Ionic4Tutorial/app/node_modules/node-sass/vendor'
    at Object.mkdirSync (fs.js:774:3)
    at sync (/home/manel/Ionic4Tutorial/app/node_modules/mkdirp/index.js:71:13)
    at Function.sync (/home/manel/Ionic4Tutorial/app/node_modules/mkdirp/index.js:77:24)
    at checkAndDownloadBinary (/home/manel/Ionic4Tutorial/app/node_modules/node-sass/scripts/install.js:114:11)
    at Object.<anonymous> (/home/manel/Ionic4Tutorial/app/node_modules/node-sass/scripts/install.js:157:1)
    at Module._compile (internal/modules/cjs/loader.js:736:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:747:10)
    at Module.load (internal/modules/cjs/loader.js:628:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:568:12)
    at Function.Module._load (internal/modules/cjs/loader.js:560:3)
  errno: -13,
  syscall: 'mkdir',
  code: 'EACCES',
  path:
   '/home/manel/Ionic4Tutorial/app/node_modules/node-sass/vendor' }

> node-sass@4.10.0 postinstall /home/manel/Ionic4Tutorial/app/node_modules/node-sass
> node scripts/build.js

Building: /usr/local/bin/node /home/manel/Ionic4Tutorial/app/node_modules/node-gyp/bin/node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
gyp info it worked if it ends with ok
gyp verb cli [ '/usr/local/bin/node',
gyp verb cli   '/home/manel/Ionic4Tutorial/app/node_modules/node-gyp/bin/node-gyp.js',
gyp verb cli   'rebuild',
gyp verb cli   '--verbose',
gyp verb cli   '--libsass_ext=',
gyp verb cli   '--libsass_cflags=',
gyp verb cli   '--libsass_ldflags=',
gyp verb cli   '--libsass_library=' ]
gyp info using node-gyp@3.8.0
gyp info using node@11.8.0 | linux | x64
gyp verb command rebuild []
gyp verb command clean []
gyp verb clean removing "build" directory
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` succeeded python2 /usr/bin/python2
gyp verb check python version `/usr/bin/python2 -c "import sys; print "2.7.14
gyp verb check python version .%s.%s" % sys.version_info[:3];"` returned: %j
gyp verb get node dir no --target version specified, falling back to host node version: 11.8.0
gyp verb command install [ '11.8.0' ]
gyp verb install input version string "11.8.0"
gyp verb install installing version: 11.8.0
gyp verb install --ensure was passed, so won't reinstall if already installed
gyp verb install version is already installed, need to check "installVersion"
gyp verb got "installVersion" 9
gyp verb needs "installVersion" 9
gyp verb install version is good
gyp verb get node dir target node version installed: 11.8.0
gyp verb build dir attempting to create "build" dir: /home/manel/Ionic4Tutorial/app/node_modules/node-sass/build
gyp ERR! configure error
gyp ERR! stack Error: EACCES: permission denied, mkdir '/home/manel/Ionic4Tutorial/app/node_modules/node-sass/build'
gyp ERR! System Linux 4.13.0-46-generic
gyp ERR! command "/usr/local/bin/node" "/home/manel/Ionic4Tutorial/app/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /home/manel/Ionic4Tutorial/app/node_modules/node-sass
gyp ERR! node -v v11.8.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
Build failed with error code: 1
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: node-sass@4.10.0 (node_modules/node-sass):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: node-sass@4.10.0 postinstall: `node scripts/build.js`
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1

added 1246 packages from 1226 contributors and audited 51336 packages in 20.228s
found 0 vulnerabilities

apparently a permission problem at least …

I did “chown -R” but always the same problem

Finally start another project and solve it, maybe i did sudo start ionic app or kind of…