[Trisquel-users] Trying to install updates - but computer says check internet connection

[curati]

I'm trying to install the security updates

When I go to System = Software and Updates

It invites me to enter admin password.

It then highlights several updates to be installed.  I try to install but it  
just returns a pop-up window saying check internet connection.

There is nothing wrong with the internet connection as all browswers are  
working fine.  Is there something else that I need to correct?

Thanks