Installing RVM in a multiuser setup on Ubuntu

Is not as easy as it sounds, you need to be within the full root environment,

to achieve this we sudo -s to root shell, and then su to create a isolated root environment.

full session transcript....

jlovick@plankton:~$ sudo -s
root@plankton:~# su
root@plankton:/home/jlovick# cd /tmp/
root@plankton:/home/jlovick# gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
root@plankton:/tmp# curl -L https://get.rvm.io | sudo bash -s stable
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 184 100 184 0 0 862 0 --:--:-- --:--:-- --:--:-- 1150
100 22817 100 22817 0 0 49363 0 --:--:-- --:--:-- --:--:-- 49363
Downloading https://github.com/wayneeseguin/rvm/archive/1.26.10.tar.gz
Downloading https://github.com/wayneeseguin/rvm/releases/download/1.26.10/1.26.10.tar.gz.asc
gpg: Signature made Mon 02 Feb 2015 10:09:00 AM CST using RSA key ID BF04FF17
gpg: Good signature from "Michal Papis (RVM signing) "
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 409B 6B17 96C2 7546 2A17 0311 3804 BB82 D39D C0E3
Subkey fingerprint: 62C9 E5F4 DA30 0D94 AC36 166B E206 C29F BF04 FF17
GPG verified '/usr/local/rvm/archives/rvm-1.26.10.tgz'

Installing RVM to /usr/local/rvm/
test -f /etc/profile.d/rvm.sh && source /etc/profile.d/rvm.sh
Installation of RVM in /usr/local/rvm/ is almost complete:

* First you need to add all users that will be using rvm to 'rvm' group,
and logout - login again, anyone using rvm will be operating with `umask u=rwx,g=rwx,o=rx`.

* To start using RVM you need to run `source /etc/profile.d/rvm.sh`
in all your open shell windows, in rare cases you need to reopen all shell windows.

# Administrator,
#
# Thank you for using RVM!
# We sincerely hope that RVM helps to make your life easier and more enjoyable!!!
#
# ~Wayne, Michal & team.

In case of problems: http://rvm.io/help and https://twitter.com/rvm_io
root@plankton:/tmp# source /etc/profile.d/rvm.sh
root@plankton:/tmp# rvm install ruby
Searching for binary rubies, this might take some time.
Found remote file https://rvm_io.global.ssl.fastly.net/binaries/ubuntu/12.04/x86_64/ruby-2.2.0.tar.bz2
Checking requirements for ubuntu.
Requirements installation successful.
ruby-2.2.0 - #configure
ruby-2.2.0 - #download

No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.2.0 - #validate archive
ruby-2.2.0 - #extract
ruby-2.2.0 - #validate binary
ruby-2.2.0 - #setup
ruby-2.2.0 - #gemset created /usr/local/rvm/gems/ruby-2.2.0@global
ruby-2.2.0 - #importing gemset /usr/local/rvm/gemsets/global.gems....................................
ruby-2.2.0 - #generating global wrappers........
ruby-2.2.0 - #gemset created /usr/local/rvm/gems/ruby-2.2.0
ruby-2.2.0 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.2.0 - #generating default wrappers........

root@plankton:/tmp# sudo adduser jlovick rvm
Adding user `jlovick' to group `rvm' ...
Adding user jlovick to group rvm
Done.
root@plankton:/tmp# sudo adduser nginx rvm
Adding user `nginx' to group `rvm' ...
Adding user nginx to group rvm
Done.