Cuando ejecutamos el comando
ionic serve -l

Aparece el siguiente error:

npm ERR! Linux 4.10.11-200.fc25.x86_64
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "run" "watch"
npm ERR! node v6.10.2
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! platzitter@0.0.0 watch: `ionic-app-scripts watch`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the platzitter@0.0.0 watch script 'ionic-app-scripts watch'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the platzitter package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     ionic-app-scripts watch
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs platzitter
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls platzitter
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/jsarangoq/Documentos/cursos/platzi/ionic-2/tabs/npm-debug.log
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##solución:
Ejecutar el siguiente comando

echo fs.inotify.max_user_watches=582222 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p