[GNC] Gnucash fails to run after upgrade from Ubuntu 14.04 to 16.04

[Colin Law]

On Thu, 8 Aug 2019 at 07:44, James E <jimmy142 at hotmail.co.uk> wrote:
>
> I  used to run  Gnucash 2.6.12  in Ubuntu 14.04 .
>
> I upgraded  to Ubuntu 16.04    . During the upgrade  I was asked if I wanted
> to keep several Gnucash   files/piece of information – one of which was  the
> Alpha Advantage API key .  I replied that I did .
>
> The upgrade appeared to have finished successfully  . All of the
> programmes/applications worked   but  with  one exception – Gnucash.

What do these commands show?
which gnucash
apt-cache policy gnucash

Colin