Enable password asterisks when run command sudo

 

Run the following command in a Terminal

sudo visudo 

Scroll down to the line that looks like this

Defaults        env_reset 

-> Defaults        env_reset,pwfeedback 

Ctrl+X , Y , enter

source : https://askubuntu.com/questions/412292/enable-password-asterisks-when-run-command-sudo/412293