Update Manager fails to update

**aakmal** · March 17th, 2013

Would appreciate any guidance on the following:

-I am running Ubuntu 12.04 LTS
-An icon consisting of a red exclamation point has appeared on the horizonal desktop bar, and tells me update information is outdated
-When running update manager, updates are downloaded. But appear to fail to install. I do not always get an error message, but
Update manager tells me last update was some time in the past, even though I have just run an update.

The original cause of my troubles began when I rashly deleted some files to fix a perceived earlier problem:

sudo rm /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise-updates_restricted_i18n_Translation-en
sudo rm /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages

Any guidance on how to get my updates working again would be greatly appreciated. Thank you.

**sanderj** · March 18th, 2013

Open a terminal, and run:

Code:

sudo apt-get update

and post the output here

**aakmal** · March 18th, 2013

Here is the tail of the ouput from sudo apt-get update:

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://extras.ubuntu.com precise 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/precise/Release

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

Thanks.

**cortman** · March 18th, 2013

Looks like you have a GPG error. Ubunt uses a GPG (encryption protocol) key to check and make sure the server it's getting the updates from is genuine. Instructions on fixing this here.