I need to install ruby1.9.3-dev
sudo apt-get install ruby1.9.3-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package ruby1.9.3-dev
E: Couldn't find any package by regex 'ruby1.9.3-dev'
It happens despite the fact that I previously did sudo apt-get update, sudo apt-get upgrade and sudo apt-get -f install.
