What happens if you run an update from a terminal? These are the two 
relevant commands:

sudo apt-get update
sudo apt-get upgrade

On 3/18/2014 8:25 AM, Dick Steffens wrote:
> I'm running Ubuntu 12.04 on two machines. I'm working on migrating from
> the older machine to the newer machine. Update Manager shows up on the
> old machine with a collection of things, but doesn't automatically show
> up no the newer machine. I start it manually on the newer machine and
> have it check for updates. It comes back with only one, which was done
> on the older machine yesterday or the day before: time zone and
> daylight-saving time data. When I tell the new machine to Install
> Updates I get an error message:
>
> Requires installation of untrusted packages.
> The action would require the installation of packages from not
> authenticated sources
> Details
> tzdata
>
> I must have something set wrong on the newer machine. I may have changed
> the setting for automatically running Update Manager when I was running
> MythTV on the box, but I wouldn't think that would have anything to do
> with not seeing all the updates the older machine sees.
>
> Any ideas as to what's going on and where to look to fix it?
>

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