can't download from software center.

**Keshav2050** · November 7th, 2011

I am not able to download anything from Ubuntu software center.
When I typed the command 'sudo apt-get update' in the terminal I got the following error.

"W: 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://in.archive.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. 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://in.archive.ubuntu.com oneiric-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/oneiric/Release

W: Some index files failed to download. They have been ignored, or old ones used instead."

What should I do?

**wildmanne39** · November 7th, 2011

Hi, this is how to replace the GPG key error when installing packages.

Code:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEYID

and replace KEYID with the number shown in the error message.
Thank you

**Keshav2050** · November 7th, 2011

I have replaced KEYID with '40976EAF437D05B5' as it was in the error. Then I tried the command
'sudo apt-get update' but then I got the following error.

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. 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://in.archive.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: 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://in.archive.ubuntu.com oneiric-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/oneiric/Release

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

What should I do?

**Keshav2050** · November 7th, 2011

Can anyone help me? I am not able to download anything from ubuntu software center.
I've typed the command 'sudo apt-get update' and I got the error

"Reading package lists... Done
W: 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://in.archive.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. 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: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/oneiric/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.
"

what should I do, can anyone help me?

**Sef** · November 7th, 2011

I would try a different server. Open the Software Center > Edit > Software Sources > change to a different one

**Keshav2050** · November 7th, 2011

Thanks for your advice.

It's not like I can't open the software center, when I click the button 'Install' it gives messages

"failed to download package files
check your internet connection"

and then,

"Requires Installation Of untrusted Packages
The action would require the installation of packages from not authenticated sources."

and in details it gives"libcddb2 libdvbpsi7 libebml3 libiso9660-7 libmatroska4 libsdl-image1.2 libtar0 libupnp3 libva-x11-1 libvcdinfo0 libxcb-keysyms1 libxcb-randr0 libxcb-xv0 videolan-doc"

What are untrusted packages and to what sources I should use so that computer will be safe?