duplicated sources list entry

[Fabio Marconi]

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)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/975312

[Smarteralec (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

[Smarteralec (smarteralec)]

oops.. "... reappeared in /var/lib/apt/lists. Btw, I no longer have a prerequists-sources.list in /etc/apt/sources.list.d/

[Dimitri John Ledkov (xnox)]

cjwatson asked to file the bug against apt, although the actual fix is probably in livecd or something like that.