Hello. I recently removed password from the main (and only) account. The thing is, while I can log on no problem, I cannot access root commands. When I try to do anything with "sudo" at the beginning, the terminal asks me for a password, and the one I was using before doesn't work. I thought it switched to some default, but when I changed root password by these instructions
it returned success, but after rebooting and logging in to my account, I discovered that nothing changed, I still can't use sudo. Does anyone know what happened and what can I do to fix it?