Comment 19 for bug 650525

This error still seems to be there. When you reinstall it, it says the keys are ok, but when you run sudo apt-get update, it doesn't go away.

sudo apt-get --reinstall install ubuntu-extras-keyring
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0B/3,424B of archives.
After this operation, 0B of additional disk space will be used.
(Reading database ... 122384 files and directories currently installed.)
Preparing to replace ubuntu-extras-keyring 2010.09.27 (using .../ubuntu-extras-keyring_2010.09.27_all.deb) ...
Unpacking replacement ubuntu-extras-keyring ...
Setting up ubuntu-extras-keyring (2010.09.27) ...
Importing extras.ubuntu.com keyring
OK
Processing extras.ubuntu.com removal keyring
OK

sudo apt-get update
Hit http://archive.canonical.com maverick Release.gpg
Ign http://archive.canonical.com/ubuntu/ maverick/partner Translation-en
Ign http://archive.canonical.com/ubuntu/ maverick/partner Translation-en_US
Get:1 http://extras.ubuntu.com maverick Release.gpg [316B]
Ign http://extras.ubuntu.com/ubuntu/ maverick/main Translation-en
Ign http://extras.ubuntu.com/ubuntu/ maverick/main Translation-en_US
Hit http://security.ubuntu.com maverick-security Release.gpg
Ign http://security.ubuntu.com/ubuntu/ maverick-security/main Translation-en
Hit http://us.archive.ubuntu.com maverick Release.gpg
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/main Translation-en
Hit http://archive.canonical.com maverick Release
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick-updates Release.gpg
Get:2 http://extras.ubuntu.com maverick Release [57.3kB]
Ign http://security.ubuntu.com/ubuntu/ maverick-security/main Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/universe Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/universe Translation-en_US
Ign http://extras.ubuntu.com maverick Release
Hit http://security.ubuntu.com maverick-security Release
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en_US
Hit http://archive.canonical.com maverick/partner i386 Packages
Ign http://extras.ubuntu.com maverick/main i386 Packages/DiffIndex
Hit http://security.ubuntu.com maverick-security/main i386 Packages
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick-backports Release.gpg
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/main Translation-en
Hit http://extras.ubuntu.com maverick/main i386 Packages
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/multiverse Translation-en
Hit http://security.ubuntu.com maverick-security/restricted i386 Packages
Hit http://security.ubuntu.com maverick-security/universe i386 Packages
Hit http://security.ubuntu.com maverick-security/multiverse i386 Packages
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-backports/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick Release
Hit http://us.archive.ubuntu.com maverick-updates Release
Hit http://us.archive.ubuntu.com maverick-backports Release
Hit http://us.archive.ubuntu.com maverick/main i386 Packages
Hit http://us.archive.ubuntu.com maverick/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick/multiverse i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/main i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/multiverse i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/main i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick-backports/multiverse i386 Packages
Fetched 317B in 1s (273B/s)
Reading package lists... Done
W: GPG error: http://extras.ubuntu.com maverick Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DB141E2302FDF932

I suspect that the key was changed and the package maintainer for ubuntu-extras-keyring forgot to update it.