There are a few known bugs related to the certificate error for
opendesktop.org:

https://www.google.com/search?q=certificate+for+api.opendesktop.org&oq=certificate+for+api.opendesktop.org&aqs=chrome..69i57.537j0j7&sourceid=chrome&es_sm=91&ie=UTF-8

And of course, there are resulutions.

You would best take this or any Ubuntu issue directly to Ubuntu forums,
wouldn't you agree?



On Tue, Sep 9, 2014 at 2:15 PM, Wayne Davis <waydavis@centurylink.net>
wrote:

> I also got this and decided to wait a day or two to see if it gets
> resolved.
>
>
>
> On 09/09/2014 12:49 PM, Derek Trotter wrote:
>
>> A few minutes ago I checked the muon update manager and tried to apply
>> the updates it said were available.  I got an error message saying the
>> certificate for api.opendesktop.org had expired.  Is this anything to be
>> concerned about?
>>
>> I have Kubuntu 14.04 installed on the machine.
>>
>>
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