My operating system is Ubuntu 14.04. I have two issues:
- When working on the GUI level whenever the operating system asks me to authenticate, I enter the ‘administrator’s password and all is fine.
- When working on the command line, the OS shows nicely ‘myusername@mycomputer’. As soon as I enter the ‘su or su -or sudo’ and a command the OS asks me for the (administrator user) password and rejects me with an ‘authentication failure’.
Any idea why? Is there any fix easy enough, apart from reloading the whole thing (OS) once more ? (I’m a newbie to Linux).