Answer by Hamfri for Angular/CLI -- auto reload doesn't happen

If angular auto-reload is not working on ubuntu 20.04 and you are using nvm try running the following:

1. sudo echo "fs.inotify.max_user_watches=524288">> /etc/sysctl.conf
2. Delete node_modules in your application's folder
3. npm uninstall -g @angular/cli
4. npm cache verify
5. npm install -g @angular/cli
6. In your application's folder run npm i

Hopefully when you run ng serve everything should work as expected now.