metasploit | install | maintenance | discovery
    apt update
    apt full-upgrade
    apt autoremove --purge
    #ruby -v
    gem update --system
    gem install bundler
    cd /opt/metasploit-framework/
    git pull
    bundle update --bundler
    bundle exec gem --version
    bundle install
    #gem install bundler:1.17.3
    yard config --gem-install-yri
and finally (may be redundant with the above)
    echo $USER@$HOSTNAME
    git config --global user.name "$USER@$HOSTNAME"
    git config --global user.email "$USER@$HOSTNAME"
    msfupdate
    chown -R msf:users /opt/metasploit-framework* /home/msf/
    su - msf
Update to the Metasploit Updates and msfupdate https://blog.rapid7.com/2013/01/17/metasploit-updates-and-msfupdate/