Public bug reported:

Update Manager fails to download any updates. It asks to check the internet 
connection, but my internet connection is fine. I have tried this with a 
connection requiring proxy and two separate connections without proxy. UM 
throws up an error message pasted below. In addition, my notification areas has 
an indicator which says:
"The update information is outdated. This may be caused by notification 
problems or by a repository that is no longer available. Please update manually 
by clicking on this icon and then selecting 'Check for Updates' and check if 
some of the listed repositories fail."

satchit@awesomeness:~$ lsb_release -rd && apt-cache policy update-manager
Description:    Ubuntu 11.10
Release:        11.10
update-manager:
  Installed: 1:0.152.25.8
  Candidate: 1:0.152.25.8
  Version table:
 *** 1:0.152.25.8 0
        500 http://in.archive.ubuntu.com/ubuntu/ oneiric-updates/main i386 
Packages
        500 http://security.ubuntu.com/ubuntu/ oneiric-security/main i386 
Packages
        100 /var/lib/dpkg/status
     1:0.152.25 0
        500 http://in.archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages

Error output:
W:GPG error: http://ppa.launchpad.net oneiric Release: The following signatures 
couldn't be verified because the public key is not available: NO_PUBKEY 
F192197F81992645, W:GPG error: http://ppa.launchpad.net oneiric Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY 326DDB7DA68563AE, W:GPG error: http://ppa.launchpad.net 
oneiric Release: The following signatures couldn't be verified because the 
public key is not available: NO_PUBKEY C2518248EEA14886, W:Failed to fetch 
http://security.ubuntu.com/ubuntu/dists/oneiric-security/Release  Unable to 
find expected entry 'independent/source/Sources' in Release file (Wrong 
sources.list entry or malformed file)
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/oneiric/Release  
Unable to find expected entry 'independent/source/Sources' in Release file 
(Wrong sources.list entry or malformed file)
, W:Failed to fetch 
http://in.archive.ubuntu.com/ubuntu/dists/oneiric-updates/Release  Unable to 
find expected entry 'independent/source/Sources' in Release file (Wrong 
sources.list entry or malformed file)
, W:Failed to fetch 
http://in.archive.ubuntu.com/ubuntu/dists/oneiric-backports/Release  Unable to 
find expected entry 'independent/source/Sources' in Release file (Wrong 
sources.list entry or malformed file)
, E:Some index files failed to download. They have been ignored, or old ones 
used instead.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: update-manager 1:0.152.25.8
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
CheckboxSubmission: 6a389bf83db22bee5a58087f9e3fc863
CheckboxSystem: 2954e74ba17fb0e37fc942cd1d9fab4e
Date: Fri Mar  9 16:23:21 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 oneiric running-unity

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https://bugs.launchpad.net/bugs/950725

Title:
  update-manager fails due to wrong sources

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