[ubuntu-za] Quantal bugs

[Jan Greeff]

Hi, is there someone who can help with this? Since upgrading to 12.10, 
hoping to get rid of some bugs on 12.04, I now have more bugs.

My Virtualbox is not running and attempts to get it going seems to have 
caused this output every time I try to run apt-get update:

  W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ quantal/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_quantal_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ precise/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_precise_contrib_binary-i386_Packages)
W: Duplicate sources.list entry 
http://download.virtualbox.org/virtualbox/debian/ precise/contrib i386 
Packages 
(/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_precise_contrib_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems

How do I get rid of a duplicate sources list? The output suggests that 
apt-get update can get rid of the problem, but apt-get update merely 
repeats that the problem exists.

Jan