apt-get -y install git-core htop vim screen fontconfig curl unzip tree

# Change timezone
echo "Europe/Paris" > /etc/timezone
dpkg-reconfigure -f noninteractive tzdata

# Configure locale
debconf-set-selections <<< 'locales locales/locales_to_be_generated select en_US.UTF-8 UTF-8'
debconf-set-selections <<< 'locales locales/default_environment_locale select en_US.UTF-8'
dpkg-reconfigure -f noninteractive locales
update-locale LANG=en_US.UTF-8
update-locale LC_CTYPE=en_US.UTF-8

apt-get -y install git-core htop vim screen fontconfig curl unzip tree

# Change timezone
echo "Europe/Paris" > /etc/timezone
dpkg-reconfigure -f noninteractive tzdata

# Configure locale
debconf-set-selections <<< 'locales locales/locales_to_be_generated select en_US.UTF-8 UTF-8'
debconf-set-selections <<< 'locales locales/default_environment_locale select en_US.UTF-8'
dpkg-reconfigure -f noninteractive locales
update-locale LANG=en_US.UTF-8
update-locale LC_CTYPE=en_US.UTF-8

# Setup known hosts
mkdir -p /home/vagrant/.ssh/
ssh-keyscan -t rsa -H github.com >> /home/vagrant/.ssh/known_hosts

Add github.com to known hosts
Add github.com to known hosts

Actuellement à chaque création de box, je me tape 
> The authenticity of host 'github.com (192.30.253.113)' can't be established.

Je ne suis pas sur que ce soit dans le bon fichier, et je n'ai pas encore testé de build la box moi même, c'est + une suggestion