I have been encountering this problem since a long:
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://archive.ubuntu.com/ maverick Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://ppa.launchpad.net/ lucid Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 4D17133CFC5D50C5
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maverick/ReleaseW: Some index files failed to download, they have been ignored, or old ones used instead.
Type the following in you terminal:
sudo aptitude -o Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update
And then:
sudo apt-get update
And this will surely help you guys.



Thanks my friend is grateful to you
Many thanks man it works great!
It didn’t work for me. I have tried several ways and still get the following errors:
W: GPG error: http://archive.canonical.com lucid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
W: GPG error: http://archive.getdeb.net lucid-getdeb Release: The following signatures were invalid: BADSIG A8A515F046D7E7CF GetDeb Archive Automatic Signing Key
I wonder if it has to do with proxi settings…
What do you refer with the proxy settings?
I am using 8.04 on a desktop at home. The error text below may be harmless . You judge please .
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I got this error after an Adobe Flash Plugin update from Ubuntu today:
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://za.archive.ubuntu.com lucid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
W: Failed to fetch http://za.archive.ubuntu.com/ubuntu/dists/lucid-updates/Release
W: Some index files failed to download, they have been ignored, or old ones used instead.
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Launchpad search found this :
[SOLVED][UBUNTU] BADSIG 40976EAF437D05B5 posted June 18th, 2010 | Author: admin
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I ran his command in terminal and got this:
chas@chas-desktop:~$ sudo aptitude -o Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update
[sudo] password for chas:
Writing extended state information… Done
Ign cdrom://Ubuntu 10.04 LTS _Lucid Lynx_ – Release i386 (20100427.1)/ lucid/main Translation-en_ZA
Ign cdrom://Ubuntu 10.04 LTS _Lucid Lynx_ – Release i386 (20100427.1)/ lucid/restricted Translation-en_ZA
Hit http://za.archive.ubuntu.com lucid Release.gpg
Hit http://security.ubuntu.com lucid-security Release.gpg
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/main Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/restricted Translation-en_ZA
Hit http://archive.canonical.com lucid Release.gpg
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/universe Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/multiverse Translation-en_ZA
Get:1 http://za.archive.ubuntu.com lucid-updates Release.gpg [198B]
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/main Translation-en_ZA
Ign http://security.ubuntu.com/ubuntu/ lucid-security/main Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/restricted Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/universe Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/multiverse Translation-en_ZA
Ign http://archive.canonical.com/ubuntu/ lucid/partner Translation-en_ZA
Ign http://security.ubuntu.com/ubuntu/ lucid-security/restricted Translation-en_ZA
Ign http://security.ubuntu.com/ubuntu/ lucid-security/universe Translation-en_ZA
Hit http://za.archive.ubuntu.com lucid Release
Hit http://archive.canonical.com lucid Release
Ign http://security.ubuntu.com/ubuntu/ lucid-security/multiverse Translation-en_ZA
Get:2 http://za.archive.ubuntu.com lucid-updates Release [44.7kB]
Err http://za.archive.ubuntu.com lucid-updates Release
Hit http://za.archive.ubuntu.com lucid/main Packages
Hit http://security.ubuntu.com lucid-security Release
Hit http://archive.canonical.com lucid/partner Packages
Hit http://za.archive.ubuntu.com lucid/restricted Packages
Hit http://za.archive.ubuntu.com lucid/universe Packages
Hit http://security.ubuntu.com lucid-security/main Packages
Hit http://za.archive.ubuntu.com lucid/multiverse Packages
Hit http://security.ubuntu.com lucid-security/restricted Packages
Hit http://security.ubuntu.com lucid-security/universe Packages
Hit http://security.ubuntu.com lucid-security/multiverse Packages
Fetched 199B in 5s (37B/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://za.archive.ubuntu.com lucid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
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I also ran his second command and got this :
chas@chas-desktop:~$ sudo apt-get update
Ign cdrom://Ubuntu 10.04 LTS _Lucid Lynx_ – Release i386 (20100427.1)/ lucid/main Translation-en_ZA
Ign cdrom://Ubuntu 10.04 LTS _Lucid Lynx_ – Release i386 (20100427.1)/ lucid/restricted Translation-en_ZA
Hit http://za.archive.ubuntu.com lucid Release.gpg
Get:1 http://security.ubuntu.com lucid-security Release.gpg [198B]
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/main Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/restricted Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/universe Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid/multiverse Translation-en_ZA
Get:2 http://za.archive.ubuntu.com lucid-updates Release.gpg [198B]
Ign http://security.ubuntu.com/ubuntu/ lucid-security/main Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/main Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/restricted Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/universe Translation-en_ZA
Ign http://za.archive.ubuntu.com/ubuntu/ lucid-updates/multiverse Translation-en_ZA
Hit http://archive.canonical.com lucid Release.gpg
Ign http://security.ubuntu.com/ubuntu/ lucid-security/restricted Translation-en_ZA
Hit http://za.archive.ubuntu.com lucid Release
Ign http://archive.canonical.com/ubuntu/ lucid/partner Translation-en_ZA
Ign http://security.ubuntu.com/ubuntu/ lucid-security/universe Translation-en_ZA
Get:3 http://za.archive.ubuntu.com lucid-updates Release [44.7kB]
Err http://za.archive.ubuntu.com lucid-updates Release
Ign http://security.ubuntu.com/ubuntu/ lucid-security/multiverse Translation-en_ZA
Hit http://za.archive.ubuntu.com lucid/main Packages
Hit http://archive.canonical.com lucid Release
Get:4 http://security.ubuntu.com lucid-security Release [44.7kB]
Hit http://za.archive.ubuntu.com lucid/restricted Packages
Hit http://za.archive.ubuntu.com lucid/universe Packages
Hit http://za.archive.ubuntu.com lucid/multiverse Packages
Hit http://archive.canonical.com lucid/partner Packages
Get:5 http://security.ubuntu.com lucid-security/main Packages [194kB]
Get:6 http://security.ubuntu.com lucid-security/restricted Packages [14B]
Get:7 http://security.ubuntu.com lucid-security/universe Packages [70.7kB]
Get:8 http://security.ubuntu.com lucid-security/multiverse Packages [4,555B]
Fetched 314kB in 11s (27.7kB/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://za.archive.ubuntu.com lucid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
W: Failed to fetch http://za.archive.ubuntu.com/ubuntu/dists/lucid-updates/Release
W: Some index files failed to download, they have been ignored, or old ones used instead.
chas@chas-desktop:~$
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Oops . I am using 10.04 on my desktop at home connecting to internet by ADSL router . No proxy server unless that is my ISP server?