I rented a server (ubuntu 12.04). They gave me a root user account.
Next, I went in and created a new user using:
# adduser <newusername>
And added a password.
The new user account works fine. I can SSH into that account with its username and password.
However, when I'm in my new user account, I can no longer use:
If I do something like:
sudo apt-get install build-essential
or something like:
I get the message:
sudo: must be setuid root
(I'm aware of similar questions asked before, but couldn't find my solution there.)