UPDATE: **I found a website about RECOVERY MODE. Will try that**
http://psychocats.net/ubuntu/sudo

I was trying to add myself to a certain group, so I issued the command in Ubuntu:

Now when I do:
I am ONLY in the group "newgroup". I LOST MY SUDO PRIVILEGES!!! How do I get this back? there is NO root account in Ubuntu. Any ideas? I did this on a WORK computer and I am the only system admin on it. If I can't get in, then I can't retrieve the files!!!! HELP!!

Boot into the single user mode (runlevel 2, if I'm right?) and alter /etc/group --> add yourself into the group sudoers (I hope it wasn't "sudo"..nope, I think it's "sudoers"), save and reboot. And next time remember to set bootloader password so nobody else can do this

The one and only flaw in Ubuntu.....

But---it is easy to fix. Once you get your sudo powers back, do this:
sudo passwd root
You'll be prompted for your password, and then to enter the new root password.

Interestingly, Distros based on Ubuntu have not propagated this silliness.

Problem fixed, guys! Booting into the RECOVERY MODE at the GRUB menu worked. I just inputted my root password, which I created during the Ubuntu installation. I added myself back to the admin group and all is fine. The only annoyance is that I had to drive over to the site and physically reboot the machine.

I am going to pass on creating a "root" account. I've seen my server trying to get hacked so many times. The most common attempt is the user "root". I'm fine with sudo and consider it an extra layer of security rather than a nuisance.