[Bug 975312] Re: duplicated sources list entry

[Smarteralec]

I have almost the same issue, but not in a Live Session.  I upgraded to 12.04 LTS via 11.10 and 12.04 Beta2.
Now I always receive a "Duplicate sources.list entry" error whenever I apt-get update.  (I update daily.) 
I'm on an amd64 machine and don't know where the i386_Packages file in /var/lib/apt/lists came from. (There is no corresponding entry in sources.list)
---msg---
W: Duplicate sources.list entry http://extras.ubuntu.com/ubuntu/ precise/main amd64 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
---end---
I tried deleting the i386_Packages file from /var/lib/apt/lists and it solved the issue until the next reboot, when it magically reappeared in

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https://bugs.launchpad.net/bugs/975312

Title:
  duplicated sources list entry

Status in “ubiquity” package in Ubuntu:
  Triaged

Bug description:
  Hello
  Start a live session of today's amd64 build and run sudo apt-get update, it will return:

  W: Duplicate sources.list entry cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Beta amd64 (20120406)/ precise/main i386 Packages (/var/lib/apt/lists/Ubuntu%2012.04%20LTS%20%5fPrecise%20Pangolin%5f%20-%20Beta%20amd64%20(20120406)_dists_precise_main_binary-i386_Packages)
  W: Duplicate sources.list entry cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Beta amd64 (20120406)/ precise/restricted i386 Packages (/var/lib/apt/lists/Ubuntu%2012.04%20LTS%20%5fPrecise%20Pangolin%5f%20-%20Beta%20amd64%20(20120406)_dists_precise_restricted_binary-i386_Packages)
  W: È consigliato eseguire "apt-get update" per correggere questi problemi

  
  Thanks
  fabio

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: ubiquity 2.10.8
  ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
  Uname: Linux 3.2.0-22-generic x86_64
  ApportVersion: 2.0-0ubuntu4
  Architecture: amd64
  CasperVersion: 1.314
  Date: Fri Apr  6 16:48:48 2012
  InstallCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- debian-installer/language=it keyboard-configuration/layoutcode?=it oem-config/enable=true
  LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120406)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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