How to do it...

The full installation process is as follows:

# curl https://raw.githubusercontent.com/rapid7/metasploit-omnibus/master/config/templates/metasploit-framework-wrappers/msfupdate.erb > msfinstall && \
> chmod 755 msfinstall && \
> ./msfinstall
  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed
100 5394 100 5394 0 0 17618 0 --:--:-- --:--:-- --:--:-- 17627
Updating package cache..OK
Checking for and installing update..
Reading package lists... Done
Building dependency tree 
Reading state information... Done
The following NEW packages will be installed:
  metasploit-framework

...

Run msfconsole to get started
W: --force-yes is deprecated, use one of the options starting with --allow instead.
# msfconsole                                                  
# cowsay++
 ____________
< metasploit >
 ------------
       \   ,__,
        \  (oo)____
           (__)    )\
              ||--|| *

...

msf >