vdw/gist:5093828

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    Install RVM on Ubuntu 12 from scratch

Clean up

1) Run the following commands to remove rvm:

rvm implode

sudo rm -rf /usr/share/ruby-rvm /etc/rvmrc /etc/profile.d/rvm.sh

2) Run the sudo apt-get --purge remove ruby-rvm command to remove ruby.
Install RVM

1) Run the sudo apt-get install curl command to install curl.

2) Run the curl -L https://get.rvm.io | bash -s stable --ruby --auto-dotfiles command  to install rvm.

3) Open new terminal and validate environment is clean from old RVM settings (should be no output) by running the env | grep rvm command.

4) Run the rvm requirements command to check requirements for your system. ex.:
sudo apt-get --no-install-recommends install bash curl git patch bzip2
sudo apt-get --no-install-recommends install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev libgdbm-dev ncurses-dev automake libtool bison subversion pkg-config libffi-dev
5) Run the echo "source $HOME/.rvm/scripts/rvm" >> ~/.bashrc command to load rvm as a function in your bash.

16.04 can't find lwebp https://developers.google.com/speed/webp/docs/compiling#unix + install lwebp + install webp
Install Ruby 1.9.3

1) Run the rvm install 1.9.3 command to install ruby 1.9.3 HEAD.

2) Run the rvm --default use 1.9.3 command to set ruby 1.9.3 as default.

3) Run the echo PS1="\$(~/.rvm/bin/rvm-prompt) $PS1" >> ~/.bashrc command to display ruby version in your bash prompt.
Troubleshooting

Can't find Magick-config

Install magick library: sudo apt-get install graphicsmagick-libmagick-dev-compat
Can't find MagickWand.h

Install magick library: sudo apt-get install libmagickwand-dev
16.04.1
sudo apt-get install libmagickwand-dev
sudo apt-get install graphicsmagick-imagemagick-compat
PATH="/usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16:$PATH" gem install rmagick -v '2.13.2'
Gem install mysql2 fails

Install mysql client library: sudo apt-get install mysql-server libmysqlclient-dev
Could not find a JavaScript runtime

Install nodejs libray: sudo apt-get install nodejs
Error connecting to Redis on 127.0.0.1:6379

Install redis 2.6.x

sudo apt-get install python-software-properties

sudo add-apt-repository ppa:chris-lea/redis-server

sudo apt-get update

sudo apt-get install redis-server