upgrade simply just does not start

Hello fellow ubunters
I confess to not being very patient. I just have tried at least five times to upgrade from 14.04 to 16.04 and this ****ing upgrade simply does not start. You get three options on the screen : no, remind me later and yes.
Since it would not start, I have tried rebooting, I have seen the selfsame options pop up, I have answered yes five times and still nothing, nada, nulla, rien.
But, with the laptop, the upgrade went on very smoothly.
Could it be this new upgrade is incompatible with an old HP DD7700?

Thanks in advance to anyone with the answer or the 'how to'.
Chris.

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upgrade simply just does not start