I've been running Kubuntu for about a month now, still learning. All of a sudden as of about two days ago, if I try to install or update software using Muon, it asks for the root password. I'm assuming this is my administrative password, but that password won't work. I know I'm typing it in correctly (case sensitive) and I haven't forgotten my admin password because I can log in to my laptop when I first turn it on using the same password.
If the administrative password is not the root password, then what is the root password? I followed some directions online regarding booting in safe mode, but i can't get the passwd command to work. I tried that twice and I keep getting an error message telling the password was not changed. Then I don't know how to exit out of safe mode. I kept hitting the escape key and that didn't work. I ended up just powering off my laptop to get out of safe mode.
sudo su -
thenpasswd
to change your root password? – AlexGreg Sep 02 '14 at 14:44