I faced the same problem and here is what worked for me.
1) Find the .bashrc file by running -
ls -la ~/ | more
2) Open in editor, in my case emacs -
emacs ~/.bashrc
3) Add an alias at the end of the file pointing to the right path of your ng directory & save the file. e.g. -
alias ng="/usr/local/lib/node_modules/@angular/cli/bin/ng"
4) Either restart the terminal or refresh it using -
sudo source ~/.bashrc
5) Now test by running ng -v
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