Problema tras actualizar Metasploit

Buenas, vengo a preguntaros sobre un problema que tengo en mi Ubuntu 12.04 LTS

Recientemente instalé Metasploit con sus dependencias y no hubo ningun problema para usarlo, pero cuando lo actualicé con msfupdate no me deja arrancarlo y me saca este error:

Código:

root@vk496:/# sudo msfconsole
/usr/lib/ruby/vendor_ruby/1.8/rubygems.rb:1177:in `remove_method': method `gem' not defined in Kernel (NameError)
	from /usr/lib/ruby/vendor_ruby/1.8/rubygems.rb:1177
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/packetfu/packetfu.rb:11
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/packetfu.rb:3
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/core/db.rb:26
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/core/db_manager.rb:4
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/core/framework.rb:68
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/core.rb:33
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/ui/console/driver.rb:1
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/ui/console.rb:10
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /opt/metasploit-4.1.4/msf3/lib/msf/ui.rb:10
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `fastlib_original_require'
	from /opt/metasploit-4.1.4/msf3/lib/fastlib.rb:368:in `require'
	from /usr/local/bin/msfconsole:128

Intenté reinstalar el rubygems pero me sigue dando el mismo problema....

Alguna sugerencia¿

Gracias a todos de antemano, Salu2