Backtrack 5r3 (Ubuntu based linux) running Metasploit framework.
Did a "msfupdate" command and msfconsole stopped working.
I read some things online, tried to fix it and only ended up making things much worse.
I am now having issues with Ruby, gem etc.
I will post a bunch of info and hopefully someone can help me as a linux noob to fix things and get my machine back to working order.

I followed the instructions here:
https://community.rapid7.com/thread/3289[1]

I also tried to install gem manually.
and got the following results.

-#msfconsole
Metasploit requires the Bundler gem to be installed
$gem install bundler

-#gem install bundler
Successfully installed bundler-1.3.5 /usr/lib/ruby/1.8/rdoc/rdc.rb:280: warning: conflicting chdir during another chdir block
/usr/lib/ruby/1.8/rdoc/rdc.rb:287: warning: conflicting chdir during another chdir block
Done installing documentation for bundler after 13 seconds
1 gem installed

-#msfconsole

still gets the Metasploit requires bundler installed message

-#ruby -v
ruby 1.9.2dev (2010-07-02) [i486-linux]

-#gem -v
2.0.3

-#gem list
LOCAL GEMS
bundler (1.3.5)

dpkg WAS showing


dpkg -l | grep ruby
ii libopenssl-ruby 4.2-2~uorppa0 OpenSSL interface for Ruby
ii libopenssl-ruby1.8 1.8.7.249-2ubuntu0.2 OpenSSL interface for Ruby 1.8
ii libreadline-ruby1.8 1.8.7.249-2ubuntu0.2 Readline interface for Ruby 1.8
ii libreadline-ruby1.9.2 1.9.2.z1-1ppa1~lucid Readline interface for Ruby 1.9.2
ii libruby1.8 1.8.7.249-2ubuntu0.2 Libraries necessary to run Ruby 1.8
ii libruby1.9.2 1.9.2.z1-1ppa1~lucid Libraries necessary to run Ruby 1.9.2
ii rdoc 4.2-2~uorppa0 Generate documentation from ruby source files
ii ruby 4.2-2~uorppa0 An interpreter of object-oriented scripting language Ruby
ii ruby1.8 1.8.7.249-2ubuntu0.2 Interpreter of object-oriented scripting language Ruby 1.8
ii ruby1.9.2 1.9.2.z1-1ppa1~lucid Interpreter of object-oriented scripting language Ruby 1.9.2
ii rubygems 1.3.7-1~uorppa0 package management framework for Ruby libraries/applications
ii rubygems1.8 1.3.7-1~uorppa0 package management framework for Ruby libraries/applications
ii rubygems1.9.2 1.3.7-1~uorppa0 package management framework for Ruby libraries/applications

someone told me to do the following-


-# update-alternatives --query ruby
-# update-alternatives --config ruby
-# apt-get --purge remove libruby1.8 ruby1.8 ruby1.8-dev rubygems1.8
-# msfupdate


which led to:


-#msfupdate
updating gems...
/opt/metasploit/msf3/msfupdate:198:in 'require' no such file to load --buffer (LoadError)
from /opt/metaspoit/msf3/msfupdate:198:in '<main>'


now gem -v error
gem -v /usr/local/lib/site_ruby/1.9.2/rubygems/gem_runner.rb:73:in <top (required)>': undefined methodload_plugins' for Gem:Module (NoMethodError) from /usr/bin/gem:9:in require' from /usr/bin/gem:9:in<main>'

dpkg is now showing for ruby-

-#dpkg -l | grep ruby
ii libreadline-ruby1.9.2 1.9.2.z1-1ppa1~lucid Readline interface for Ruby 1.9.2
ii libruby1.9.2 1.9.2.z1-1ppa1~lucid Libraries necessary to run Ruby 1.9.2
ii ruby1.9.2 1.9.2.z1-1ppa1~lucid Interpreter of object-oriented scripting language Ruby 1.9.2
ii rubygems1.9.2 1.3.7-1~uorppa0 package management framework for Ruby libraries/applications