@lyncia if you set a root password AND a user password during the installation of Debian, then the user will not be added to the sudoers file
Debian is the only distro that does this and it's only this way because the maintainers are evil people who like to see you suffer
https://forums.debian.net/viewtopic.php?t=152483
@lyncia you would assume that, wouldn't you
but yeah I have run into this same problem before and it's the main thing that turned me off of Debian forever