I'm trying to install ruby on rails from scratch on Ubuntu 12.10. Getting help from this post:

echo "[[ -s '${HOME}/.rvm/scripts/rvm' ]] && source '${HOME}/.rvm/scripts/rvm'" >> ~/.bashrc

echo "[[ -s '${HOME}/.rvm/scripts/rvm' ]] && source '${HOME}/.rvm/scripts/rvm'" >> ~/.zshrc



curl -L https://get.rvm.io | bash -s stable



# Then run this in order to make rvm work:

source /home/adige/.rvm/scripts/rvm



# And installed zlib, before ruby:

rvm pkg install zlib



# Last step, installed ruby:

rvm install 1.9.3 --with-zlib-dir=/home/adige/.rvm/usr

But the problem is when i try to install gems i get this error:

adige@adige-LG:~$ gem install rails

ERROR:  Loading command: install (LoadError)

    cannot load such file -- zlib

ERROR:  While executing gem ... (NameError)

    uninitialized constant Gem::Commands::InstallCommand

I already have these:

curl zlib1g-dev zlib1g libssl-dev build-essential openssl libreadline6 libreadline6-dev curl git-core libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion pkg-config

So what may be the problem?