subh@subh:~$ sudo apt-get update
[sudo] password for subh:
Ign http://us.archive.ubuntu.com oneiric InRelease
Ign http://us.archive.ubuntu.com oneiric-updates InRelease
Ign http://us.archive.ubuntu.com oneiric-backports InRelease
Ign http://security.ubuntu.com oneiric-security InRelease
Get:1 http://security.ubuntu.com oneiric-security Release.gpg [198 B]
Get:2 http://us.archive.ubuntu.com oneiric Release.gpg [198 B]
Get:3 http://us.archive.ubuntu.com oneiric-updates Release.gpg [198 B]
Ign http://extras.ubuntu.com oneiric InRelease
Hit http://security.ubuntu.com oneiric-security Release
Get:4 http://us.archive.ubuntu.com oneiric-backports Release.gpg [198 B]
Get:5 http://extras.ubuntu.com oneiric Release.gpg [72 B]
Err http://security.ubuntu.com oneiric-security Release

Hit http://us.archive.ubuntu.com oneiric Release
Hit http://extras.ubuntu.com oneiric Release
Ign http://us.archive.ubuntu.com oneiric Release
Ign http://extras.ubuntu.com oneiric Release
Get:6 http://us.archive.ubuntu.com oneiric-updates Release [40.8 kB]
Ign http://extras.ubuntu.com oneiric/main Sources/DiffIndex
Ign http://extras.ubuntu.com oneiric/main i386 Packages/DiffIndex
Ign http://extras.ubuntu.com oneiric/main TranslationIndex
Hit http://extras.ubuntu.com oneiric/main Sources
Hit http://us.archive.ubuntu.com oneiric-backports Release
Ign http://us.archive.ubuntu.com oneiric-backports Release
Hit http://extras.ubuntu.com oneiric/main i386 Packages
Ign http://us.archive.ubuntu.com oneiric/main Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/restricted Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/universe Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/multiverse Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/main i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/restricted i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/universe i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com oneiric/multiverse i386 Packages/DiffIndex
Hit http://us.archive.ubuntu.com oneiric/main TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/multiverse TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/restricted TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/universe TranslationIndex
Get:7 http://us.archive.ubuntu.com oneiric-updates/main Sources [121 kB]
Get:8 http://us.archive.ubuntu.com oneiric-updates/restricted Sources [1,337 B]
Get:9 http://us.archive.ubuntu.com oneiric-updates/universe Sources [41.7 kB]
Get:10 http://us.archive.ubuntu.com oneiric-updates/multiverse Sources [3,654 B]
Get:11 http://us.archive.ubuntu.com oneiric-updates/main i386 Packages [282 kB]
Ign http://extras.ubuntu.com oneiric/main Translation-en_US
Ign http://extras.ubuntu.com oneiric/main Translation-en
Get:12 http://us.archive.ubuntu.com oneiric-updates/restricted i386 Packages [2,968 B]
Get:13 http://us.archive.ubuntu.com oneiric-updates/universe i386 Packages [93.4 kB]
Get:14 http://us.archive.ubuntu.com oneiric-updates/multiverse i386 Packages [6,336 B]
Get:15 http://us.archive.ubuntu.com oneiric-updates/main TranslationIndex [74 B]
Get:16 http://us.archive.ubuntu.com oneiric-updates/multiverse TranslationIndex [72 B]
Get:17 http://us.archive.ubuntu.com oneiric-updates/restricted TranslationIndex [71 B]
Get:18 http://us.archive.ubuntu.com oneiric-updates/universe TranslationIndex [73 B]
Ign http://us.archive.ubuntu.com oneiric-backports/main Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/restricted Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/universe Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/multiverse Sources/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/main i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/restricted i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/universe i386 Packages/DiffIndex
Ign http://us.archive.ubuntu.com oneiric-backports/multiverse i386 Packages/DiffIndex
Hit http://us.archive.ubuntu.com oneiric-backports/main TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/restricted TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/universe TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/main Sources
Hit http://us.archive.ubuntu.com oneiric/restricted Sources
Hit http://us.archive.ubuntu.com oneiric/universe Sources
Hit http://us.archive.ubuntu.com oneiric/multiverse Sources
Hit http://us.archive.ubuntu.com oneiric/main i386 Packages
Hit http://us.archive.ubuntu.com oneiric/restricted i386 Packages
Hit http://us.archive.ubuntu.com oneiric/universe i386 Packages
Hit http://us.archive.ubuntu.com oneiric/multiverse i386 Packages
Hit http://us.archive.ubuntu.com oneiric/main Translation-en
Hit http://us.archive.ubuntu.com oneiric/multiverse Translation-en
Hit http://us.archive.ubuntu.com oneiric/restricted Translation-en
Hit http://us.archive.ubuntu.com oneiric/universe Translation-en
Get:19 http://us.archive.ubuntu.com oneiric-updates/main Translation-en [131 kB]
Hit http://us.archive.ubuntu.com oneiric-updates/multiverse Translation-en
Hit http://us.archive.ubuntu.com oneiric-updates/restricted Translation-en
Hit http://us.archive.ubuntu.com oneiric-updates/universe Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/main Sources
Hit http://us.archive.ubuntu.com oneiric-backports/restricted Sources
Hit http://us.archive.ubuntu.com oneiric-backports/universe Sources
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse Sources
Hit http://us.archive.ubuntu.com oneiric-backports/main i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/restricted i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/universe i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/main Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/restricted Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/universe Translation-en
Fetched 725 kB in 4s (146 kB/s)
Reading package lists... Done
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com oneiric-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

W: GPG error: http://us.archive.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://extras.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://us.archive.ubuntu.com oneiric-backports Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.
subh@subh:~$