Ubuntu Mate 22.04 on Rpi-4 correct password for initial user is not valid for sudo

after I have setup the installation of 22.04 on my Raspberry Pi-4, I can not use the correct Password from the initial user.
sudo apt-get update asking for the user password, but is never accepting the correct PW.
To change the PW with GUI accept the PW for ligitimation but can not change the PW itself.

hmmmm, is it possible that a special char is not working in PW? e.g. @

1 Like

Welcome @Goldwolle to the community!