Debian Buster, KDE-Plasma
I'm a newbbie on Linux and Programming and I broke something installing Python 3.8 and I can't find a solution because I can;t really find what I did. I'm really interested on understand what's happenig, because I'd like to learn a lot about Linux, but I came from Windows, and user's accounts and permissions are still a mistery for me.
I have an idea about what I did wrong and I can describe the symptoms. what I did wrong: I used something similar to "usermod -a -G root my_user_name" to give sudo permissions to my user account.
The symptoms are:
I lost my login-name in login screen under Plasma. No user account, neither user icon. Before breaking the system I only had to write password, now I also have to enter my user name too. Login screen is from Gnome, switch-user screen is from Plasma.
On desktop everything is ok, but when I open Konsole, my user starting folder is /root, and root is starting in home/user folder. I'm completly lost.
Something has also changed on permissions, because though I'm not using SU account, managing some installations and some operations ask for used password, when I was used to enter Root password.
I've been searching internet and I can't find what I modified to get this behaviour.
I took a look at /etc/passwd andthe only thing that look strange is a line where my complete name is written and the starting folder is /bin/bash. If I change this into /home/user, things get worse, because konsole complies about a problem and cant be started. I also looked at etc/groups and can't figure out if something is wrong .
I don't want to touch any more before getting a clear idea about the situation, because system is full of apps and took me a lot of hours to configure it like this.
