Unless you set up the root account, Ubuntu uses sudo to make changes, 
such as:

sudo apt-get install foobar

You would use the main account you configured for this.

mhoy4@cox.net wrote:
> I lost all my old emails so I can't respond to my last one about the 
> lost drive space. Basically I just reinstalled windows and gave up on 
> dual boot.
>
> Now I'm using virtual box to run Ubuntu. I've got it installed, but 
> having trouble gaining admin privileges  in  a terminal window. Perhaps 
> I'm not typing it right.
>
> I'm trying: su
> then typing the password, but it says Authentication Failure. I'm using 
> the same password I would use when prompted for it in graphical. Is 
> there some other command to gain root in terminal on Ubuntu?
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