Aight! I found the answer!

https://github.com/rdp/ruby_tutorials_core/wiki/ruby-talk-faq#wiki-gem_loading_fails_191

Command:
ruby --disable-gems filename.rb

does the trick.

+ include...

I wrote a small script in ruby which make use of Nokogiri and tried to fire it up in Backtrack 5 but it didn't seem to load.

The error message is :filename.rb:5 'require' no such file to load...

While updating BT5 KDE 64 bit, there was an error updating Metasploit and it disappeared from my HDD.

My problem seems to be the same as these gentlemen right there:
...

Hello guys

I have had to re-install backtrack a few times and after several freezes I had to just to power off the computer.
At first everything worked fine, but now even after completely formatting, this...