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4

I tried installing VLC Player yesterday, and I got the Requires installation of untrusted packages error. I searched for hours for a solution to this problem, and finally came upon a suggestion that said to change servers for downloading updates from. I did this, and it gave me a 404 error when I clicked on "Check" in the Update Manager. I tried switching my server back to the main one (and after that, several other ones), but I am now still getting a 404 error: enter image description here

And the other error I get when downloading or updating: enter image description here

Edit: Output of cat /etc/apt/sources.list:

deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted #Added by software-properties

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates restricted main multiverse universe #Added by software-properties

## 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://us.archive.ubuntu.com/ubuntu/ precise universe
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates 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.

## 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.
deb http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse #Added by software-properties

deb http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-security restricted main multiverse universe #Added by software-properties
deb http://us.archive.ubuntu.com/ubuntu/ precise-security universe

## 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.
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paste output cat /etc/apt/sources.list and then gpg --list-keys paste in paste Ubuntu – Gaurav_Java Sep 8 '12 at 4:28
I edited my question. – Isaiah Bugarin Sep 8 '12 at 4:49

3 Answers

up vote 13 down vote accepted
+50

Based on the errors you pasted in the comments section of my previous answer, I have another possible solution: 

sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean 
sudo apt-get update

This will rebuild the cache.
Courtesy:http://ubuntuforums.org/showthread.php?t=1983220#8

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Thank you! I actually stumbled upon that thread just a few minutes before you posted it. – Isaiah Bugarin Sep 8 '12 at 14:47
@IsaiahBugarin : If this helped you, I recommend accepting the answer so that the question will be marked as solved. – Steve Kroon Sep 9 '12 at 10:01
up vote 3 down vote

This link may help. It addresses a very similar problem.

Basically, you open a terminal and type sudo apt-get update && sudo apt-get upgrade. That did it for me.

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up vote 0 down vote

When I get an error as in the third image. I install the packages via terminal. Use: sudo apt-get update and then
sudo apt-get upgrade. In the second step you'll be asked for a confirmation, which will be similar to what you see below: 

WARNING: The following packages cannot be authenticated!
patch
Install these packages without verification [y/N]?

Reply to the above with y, then that package will be installed.
After that update should work normally again.

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I get a 404 error on the last few lines when it runs sudo apt-get update – Isaiah Bugarin Sep 8 '12 at 4:34
Could you post that somewhere and post the link. Also even if the 404 occurs, do try sudo apt-get upgrade, as said above. That may help. If not please post that 404. – saji89 Sep 8 '12 at 4:35
Here's the lines that gave me a 404 error: *Err ppa.launchpad.net precise/main Sources *W: Failed to fetch ppa.launchpad.net/awn-testing/ppa/ubuntu/dists/precise/main/… *W: Failed to fetch ppa.launchpad.net/awn-testing/ppa/ubuntu/dists/precise/main/… – Isaiah Bugarin Sep 8 '12 at 4:37
I also got this error: W: GPG error: us.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com> – Isaiah Bugarin Sep 8 '12 at 4:40
Are you using squid apt-cache? – saji89 Sep 8 '12 at 6:38

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