[Trisquel-users] Gimp 2.8 ppa not working

[thelastturner]

Hi I tried to install gimp 2.8 from a ppa (ppa:otto-kesselgulasch/gimp) but  
when I try to update gimp 2.6 to gimp 2.8 say gimp is already on the newest  
version.
How can I get gimp to upgrade to 2.8?