Unable to run lerna's command

Try running the command

npm install --g lerna

In my case, I just run sudo npm install --g lerna, and it works after bootstrap

Three things:

1. Please check environment, if the path is correctly setup or not, for command not found error.
2. Second, you can go directly lerna folder and execute the command. If you are able to run from here that means problem is there in path ie point 1
3. The third option is re-install and install it again.