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Ubuntu: Clearing GPG -- BADSIG Errors During Update
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Bill Malchisky    

In updating my Ubuntu LTS host OS caused me to receive several GPG BADSIG errors, visually captured in the following Update Manager error message.

Image:Ubuntu: Clearing GPG -- BADSIG Errors During Update

You can see the errors more closely via a terminal window.

malchw@san-domino:~$ sudo apt-get update


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 precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key

W: GPG error:
http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG B22A95F88110A93A Launchpad PPA for Bumlebee Project

Two ways to resolve -- persistent and the brute force methods. I'll demonstrate the former first, then the latter for a stubborn error.


Persistent Solution

Step 0 -- malchw@san-domino:~$ sudo apt-get clean
Step 1 Combo -- malchw@san-domino:~$ sudo apt-get update && sudo apt-get upgrade

This was enough to get me to update my files sans issue, but the BADSIG errors remained.

The following packages have been kept back:

linux-image-generic

The following packages will be upgraded:

apparmor apport apport-gtk dh-apparmor flashplugin-installer

gnome-control-center gnome-control-center-data google-chrome-stable

icedtea-6-jre-cacao icedtea-6-jre-jamvm icedtea-7-jre-jamvm krb5-locales

libavcodec-extra-53 libavformat53 libavutil-extra-51 libc-bin libc-dev-bin

libc6 libc6:i386 libc6-dev libc6-i386 libgnome-control-center1

libgssapi-krb5-2 libgssapi-krb5-2:i386 libjs-jquery libk5crypto3

libk5crypto3:i386 libkrb5-3 libkrb5-3:i386 libkrb5support0

libkrb5support0:i386 libpostproc52 libswscale2 linux-libc-dev

multiarch-support openjdk-6-jre openjdk-6-jre-headless openjdk-6-jre-lib

openjdk-7-jre openjdk-7-jre-headless postfix python-apport

python-problem-report

43 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

Need to get 158 MB of archives.

After this operation, 4,047 kB of additional disk space will be used.

Do you want to continue [Y/n]? Y


Though pleased to have the long list of updated applications completed, I wanted to remove the errors. Onward to step two.
Wanting to rule out any caching issues for installed packages, I removed that from the permutation list.

Step 2 -- malchw@san-domino:~$ sudo apt-get update -o Acquire::http::No-Cache=True
Next, run Step 1 Combo, to see if things improve. For me, I needed to continue troubleshooting.

Thanks to AskUbuntu for the next command.
Step 3 -- malchw@san-domino:~$ sudo apt-get update -o Acquire::BrokenProxy=true
Then run Step 1 Combo.

If the command comes back sans error(s), then you are finished. Else, time for more drastic actions.


Brute Force Solution

The solution depicted below is listed on over three sites sites, thus I am unable to provide an accurate attribution.

malchw@san-domino:~$ sudo apt-get clean
malchw@san-domino:~$ cd /var/lib/apt
malchw@san-domino:/var/lib/apt$ sudo mv lists lists.old
malchw@san-domino:/var/lib/apt$ sudo mkdir -p lists/partial
malchw@san-domino:/var/lib/apt$ sudo apt-get clean
malchw@san-domino:/var/lib/apt$ sudo apt-get update


Hit
http://us.archive.ubuntu.com precise-updates Release.gpg
Hit
http://us.archive.ubuntu.com precise Release.gpg                          
Hit
http://us.archive.ubuntu.com precise-backports Release.gpg                
Hit
http://us.archive.ubuntu.com precise-updates Release        
...

Ign
http://ppa.launchpad.net precise/main Translation-en_US
Ign
http://ppa.launchpad.net precise/main Translation-en
Ign
http://ppa.launchpad.net precise/main Translation-en_US
Ign
http://ppa.launchpad.net precise/main Translation-en
Reading package lists... Done


Running the clean returned no results which is normal, but the update here, proved rewarding: came back error free. So, if the persistent approach does not clear your BADSIG error(s), then the brute force option is your best bet.

Good luck.

---------------------
http://www.BillMal.com/billmal/billmal.nsf/dx/ubuntu-gpg-badsig.htm
Sep 03, 2014
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