apt-get install software-properties-common
add-apt-repository: command not found
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apt-get install software-properties-common
wget -O - http://dl.hhvm.com/conf/hhvm.gpg.key | apt-key add -
echo deb http://dl.hhvm.com/ubuntu DISTRIBUTION_VERSION main | sudo tee /etc/apt/sources.list.d/hhvm.list
apt-get update
apt-get autoremove