Enable password feedback when entering sudo password

You need to add pwfeedback to the sudo defaults, there are two ways to do it, the latter is probably better

By editing /etc/sudoers

Run visudo (allows editing sudo config safely)

sido visudo

Find 'Defaults' section:

Defaults env_reset

Add pwfeedback to 'Defaults'

Defaults env_reset,pwfeedback

By adding a special sudoers.d custom rule file

Alternatively you can also add the following file

/etc/sudoers.d/enable-pwfeedback

Containing this string:

Defaults pwfeedback