I am trying to install Darktable on my Ubuntu 12.04 64bit desktop computer. When I attempt to install it through the Ubuntu Software Centre I get a warning:
"Requires installation of untrusted packages"
The "Details" are: darktable libflickcurl0 liblensfun-data liblensfun0
There are two options, OK and Repair. If I choose Repair, it fails to "download repository information".
If I try to add the PPA via terminal and install it, I get cryptic messages about not being able to verify the gpgkey.
Does this mean it is unsafe to install? I would really like to get this running (safely) as I am a professional photographer and I want to share my workflow with the Linux community.