It is not clear from your posts if you are saying simply that you see nothing (such as **) when you enter the sudo password or if something has changed. THe standard sudo user is the first user created during the install and that user password is what should be used with sudo. WHen you enter a command prefixed by sudo, hit the Enter key you go to a prompt where you are expected to enter the appropriate password. Nothing will show on screen when you are entering the password characters. Is this your situation? Is this a new install of Deepin? Have you ever successfully used sudo. There is no 'default' root password for ann install.

@perfectjusticex
If you have a root account enabled with password on that machine you should be able to (when logged in as your regular user) use 'su -' then enter the root password and login as root.

If you do not have a root password assigned and you are unable to do the above then you can boot to single user mode.

Either way you should 1.) assign a root password and 2.) put your regular user into the correct group to become an administrator with access to sudo.

On RedHat derivatives that is the 'wheel' group and (I think) for debian derivatives it is the 'sudo' group. I know it is 'sudo' for Ubuntu.

reported spam (text copied from https://www.deepin.org/en/2021/08/16/deepin-20-2-3/)