title: RVM installation: `/usr/local/rvm': Permission denied
body: <pre><code>demas@demas:~$ sudo rm -rf /etc/rvmrc /etc/profile.d/rvm.sh /usr/local/rvm
  
  demas@demas:~$ curl -L https://get.rvm.io | bash -s stable
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100   184  100   184    0     0    218      0 --:--:-- --:--:-- --:--:--   308
  100 13145  100 13145    0     0  12150      0  0:00:01  0:00:01 --:--:-- 12150
  mkdir: cannot create directory `/usr/local/rvm': Permission denied
  </code></pre>
  
  <p>How can I fix it ?</p>