~/UnrealEngine $ ./Setup.sh
Registering git hooks… (this will override existing ones!)
dpkg-query: no packages found matching clang-3.9
Attempting installation of missing package: clang-3.9
sudo apt-get install -y clang-3.9
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package clang-3.9
E: Couldn’t find any package by glob ‘clang-3.9’
E: Couldn’t find any package by regex ‘clang-3.9’
Setup did not complete because it assumed Ubuntu 16.10 and not Mint, so it tried to install packages that aren’t available in Mint. You will have to edit it to make sure it doesn’t fail on your system.