How to change admin user for GUI?

[Colin Law]

On 6 November 2012 22:04, Colin Law <clanlaw at googlemail.com> wrote:
> On 6 November 2012 19:43, Josef Wolf <jw at raven.inka.de> wrote:
>> Hello,
>>
>> I have installed ubuntu-12.4 for a friend. Since he is not a computer guy and
>> I will need to do the administration on this computer, the first admin account
>> I created was an account for me. Then I created a second admin account for
>> him. We can both use sudo to do the administration on command line.
>>
>> Since he is not familiar with the command line, he is doing everything with
>> the GUI. But when he does anything that needs root permissions (e.g. update
>> the system), the GUI asks for _my_ password.
>
> Do you mean when he runs an application?  If so how is he starting it.
>  Or do you mean just the Update Manager when it comes up
> automatically?

Also, does he then see a dialog asking for the password, but with a
username above it?  If so he should be able to change the username to
himself and then enter his password.

Colin