Your site insturctions for installing Flatpak needs updating

[David Hall]

Greetings 
I am trying to install the latest version of PITIVI via your Flatpak option but in doing so I got the followin
 sudo add-apt-repository ppa:alexlarsson/flatpak
'This PPA does not support trusty'
Cannot add PPA: ''This PPA does not support trusty''.
  after carrying out your instructions 

Your assistance in getting beyond this point will be much appreciated
Thanks for all you do
dhlyfe
  
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