I get the error while installing a package (.deb) :
ratatouille_0.1.1-1_i386.deb
(156.8 KiB) from here:
https://launchpad.net/~keithw/+archive/ubuntu/ratatouille/+sourcepub/4418864/+listing-archive-extra
I tried installing libprotobuf-dev but it's already installed.