Установите ruby-rvm на Ubuntu 11.10 с ruby 1.9.3

rvm устанавливается правильно: sudo apt-get install ruby-rvm

Когда я пытаюсь установить ruby 1.9.3, я получаю эти ошибки?

anthony@SnakeDoc:~$ rvm install 1.9.3
mkdir: cannot create directory `/usr/share/ruby-rvm/gems/ruby-1.9.3-p0': Permission      denied
Installing Ruby from source to: /usr/share/ruby-rvm/rubies/ruby-1.9.3-p0, this may take   a while depending on your cpu(s)...

ruby-1.9.3-p0 - #fetching 
ruby-1.9.3-p0 - #extracting ruby-1.9.3-p0 to /usr/share/ruby-rvm/src/ruby-1.9.3-p0
/usr/share/ruby-rvm/scripts/functions/utility: line 142: /usr/share/ruby-rvm/log/ruby-    1.9.3-p0/extract.log: Permission denied
/usr/share/ruby-rvm/scripts/functions/utility: line 148: /usr/share/ruby-rvm/log/ruby-  1.9.3-p0/extract.log: Permission denied
ERROR: Error running 'bunzip2 < '/usr/share/ruby-rvm/archives/ruby-1.9.3-p0.tar.bz2' |   tar xf - -C /usr/share/ruby-rvm/tmp/rvm_src_23435', please read /usr/share/ruby-  rvm/log/ruby-1.9.3-p0/extract.log
ERROR: There has been an error while trying to extract the source.  
Halting the installation.
ERROR: There has been an error fetching the ruby interpreter. Halting the installation.

Я пытался chmod каталоги, где я получаю отказ в доступе, но это не устраняет проблему. Есть предложения?