3 error conditions
Upgrade Ruby
Download GPG public key
gpg2 --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
or
curl -sSL https://rvm.io/mpapis.asc | gpg2 --import
or
curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import (My Choice)
Download RVM and set up environment
curl -L http://get.rvm.io | bash -s stable
source /usr/local/rvm/scripts/rvm
View existing Ruby versions
rvm list known
Upgrade to 2.4.0
rvm install 2.4.0
Install RPM again
gem install fpm
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