updating my application library error

[ubilli]

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: GPG error: http://ng.archive.ubuntu.com precise 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/precise/Release


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

[slickymaster]

Hi ubilli, try to clean the content of /var/lib/apt/lists directory and rebuild it:

sudo rm -fr /var/lib/apt/lists
sudo mkdir -pv /var/lib/apt/lists/partial
sudo apt-get update

[ubilli]

Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)/dists/raring/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)/dists/raring/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Some index files failed to download. They have been ignored, or old ones used instead.

[ubilli]

this is what it said...

[slickymaster]

Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)/dists/raring/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)/dists/raring/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Some index files failed to download. They have been ignored, or old ones used instead.

Assuming that is the output you obtained after cleaning the content of your /var/lib/apt/lists directory and you've run the command

sudo apt-get update && sudo apt-get upgrade

apparently your first problem is solved and now the update manager is looking for packages on the Ubuntu CD/DVD. If it is not inserted you get that error. You can disable the CD as package source. Open the software center, go to Edit/Software Sources... and disable the CD on the first tab.

[ubilli]

W: Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)/dists/raring/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs


W: Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)/dists/raring/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs


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

[slickymaster]

Have you tried any of the suggestions made?
If you really want someone to be able to provide some help, it isn't enough just to post some output, you should also explain what you've done in order to get said output.

Can you please post the output of:

cat /etc/apt/sources.list

[ubilli]

# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)]/ dists/precise/main/binary-i386/


# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)]/ precise main restricted


# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)]/ dists/raring/main/binary-i386/
deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)]/ dists/raring/restricted/binary-i386/
deb http://ng.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://ng.archive.ubuntu.com/ubuntu/ precise main restricted


## Major bug fix updates produced after the final release of the
## distribution.


## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ng.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://ng.archive.ubuntu.com/ubuntu/ precise universe


## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ng.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://ng.archive.ubuntu.com/ubuntu/ precise multiverse


## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.




## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner


## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
deb http://archive.canonical.com/ precise partner
deb-src http://archive.canonical.com/ precise partner


this is the output of what you said i should do...

[ubilli]

am sorry for not commenting...slickymaster

[fantab]

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)]/ dists/raring/main/binary-i386/
deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)]/ dists/raring/restricted/binary-i386/

There is your problem.

gksu gedit /etc/apt/sources.list

... and add # in front of the deb as suggested below:

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
#deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)]/ dists/raring/main/binary-i386/
#deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha i386 (20130417)]/ dists/raring/restricted/binary-i386/

Close Gedit. and in terminal run:

sudo apt-get update && sudo apt-get upgrade

EDIT: By the way what is your Ubuntu Version, 12.04 or 13.04?