I am newbie with Ubuntu.I am trying to download Okular pdf reader from Software Center but I am getting some error.
At first it was asking for installation of packages from not authenticated source,when I click on Use this source it goes and do something like
upadating cache 
Then after some time it shows me this error:
I read this question "Requires installation of untrusted packages?"and tried to rebuild cache as given in first answer using :
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
and got this output:
yogeshwardancharan@ubuntu:~$ sudo apt-get clean
[sudo] password for yogeshwardancharan:
yogeshwardancharan@ubuntu:~$ cd /var/lib/apt
yogeshwardancharan@ubuntu:/var/lib/apt$ sudo mv lists lists.old
yogeshwardancharan@ubuntu:/var/lib/apt$ sudo mkdir -p lists/partial
yogeshwardancharan@ubuntu:/var/lib/apt$ sudo apt-get clean
yogeshwardancharan@ubuntu:/var/lib/apt$ sudo apt-get update
Get:1 http://dl.google.com stable Release.gpg [198 B]
Get:2 http://dl.google.com stable Release.gpg [198 B]
Get:3 http://dl.google.com stable Release [1,347 B]
Get:4 http://ppa.launchpad.net quantal Release.gpg [316 B]
Ign http://security.ubuntu.com quantal-security Release.gpg
Get:5 http://dl.google.com stable Release [1,347 B]
Ign http://us.archive.ubuntu.com quantal Release.gpg
Get:6 http://dl.google.com stable/main i386 Packages [1,227 B]
Get:7 http://ppa.launchpad.net quantal Release.gpg [316 B]
Ign http://security.ubuntu.com quantal-security Release
Ign http://us.archive.ubuntu.com quantal-updates Release.gpg
Get:8 http://ppa.launchpad.net quantal Release [11.9 kB]
Get:9 http://dl.google.com stable/main i386 Packages [710 B]
Ign http://us.archive.ubuntu.com quantal-backports Release.gpg
Get:10 http://ppa.launchpad.net quantal Release [11.9 kB]
Ign http://us.archive.ubuntu.com quantal-proposed Release.gpg
Get:11 http://ppa.launchpad.net quantal/main Sources [4,251 B]
Ign http://us.archive.ubuntu.com quantal Release
Get:12 http://ppa.launchpad.net quantal/main i386 Packages [14.3 kB]
Ign http://us.archive.ubuntu.com quantal-updates Release
Ign http://us.archive.ubuntu.com quantal-backports Release
Ign http://us.archive.ubuntu.com quantal-proposed Release
Get:13 http://ppa.launchpad.net quantal/main Sources [16.7 kB]
Get:14 http://ppa.launchpad.net quantal/main i386 Packages [39.4 kB]
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Ign http://ppa.launchpad.net quantal/main Translation-en_US
Ign http://ppa.launchpad.net quantal/main Translation-en
Ign http://ppa.launchpad.net quantal/main Translation-en_US
Ign http://ppa.launchpad.net quantal/main Translation-en
Err http://security.ubuntu.com quantal-security/main Sources
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/restricted Sources
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/universe Sources
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/multiverse Sources
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/main i386 Packages
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/restricted i386 Packages
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/universe i386 Packages
404 Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com quantal-security/multiverse i386 Packages
404 Not Found [IP: 91.189.92.201 80]
Ign http://security.ubuntu.com quantal-security/main Translation-en_US
Ign http://security.ubuntu.com quantal-security/main Translation-en
Ign http://security.ubuntu.com quantal-security/multiverse Translation-en_US
Ign http://security.ubuntu.com quantal-security/multiverse Translation-en
Ign http://security.ubuntu.com quantal-security/restricted Translation-en_US
Ign http://security.ubuntu.com quantal-security/restricted Translation-en
Ign http://security.ubuntu.com quantal-security/universe Translation-en_US
Ign http://security.ubuntu.com quantal-security/universe Translation-en
Err http://us.archive.ubuntu.com quantal/main Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/restricted Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/universe Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/multiverse Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/main i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/restricted i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/universe i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal/multiverse i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Ign http://us.archive.ubuntu.com quantal/main Translation-en_US
Ign http://us.archive.ubuntu.com quantal/main Translation-en
Ign http://us.archive.ubuntu.com quantal/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com quantal/multiverse Translation-en
Ign http://us.archive.ubuntu.com quantal/restricted Translation-en_US
Ign http://us.archive.ubuntu.com quantal/restricted Translation-en
Ign http://us.archive.ubuntu.com quantal/universe Translation-en_US
Ign http://us.archive.ubuntu.com quantal/universe Translation-en
Err http://us.archive.ubuntu.com quantal-updates/main Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/restricted Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/universe Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/multiverse Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/main i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/restricted i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/universe i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-updates/multiverse i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Ign http://us.archive.ubuntu.com quantal-updates/main Translation-en_US
Ign http://us.archive.ubuntu.com quantal-updates/main Translation-en
Ign http://us.archive.ubuntu.com quantal-updates/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com quantal-updates/multiverse Translation-en
Ign http://us.archive.ubuntu.com quantal-updates/restricted Translation-en_US
Ign http://us.archive.ubuntu.com quantal-updates/restricted Translation-en
Ign http://us.archive.ubuntu.com quantal-updates/universe Translation-en_US
Ign http://us.archive.ubuntu.com quantal-updates/universe Translation-en
Err http://us.archive.ubuntu.com quantal-backports/main Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/restricted Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/universe Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/multiverse Sources
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/main i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/restricted i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/universe i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-backports/multiverse i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Ign http://us.archive.ubuntu.com quantal-backports/main Translation-en_US
Ign http://us.archive.ubuntu.com quantal-backports/main Translation-en
Ign http://us.archive.ubuntu.com quantal-backports/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com quantal-backports/multiverse Translation-en
Ign http://us.archive.ubuntu.com quantal-backports/restricted Translation-en_US
Ign http://us.archive.ubuntu.com quantal-backports/restricted Translation-en
Ign http://us.archive.ubuntu.com quantal-backports/universe Translation-en_US
Ign http://us.archive.ubuntu.com quantal-backports/universe Translation-en
Err http://us.archive.ubuntu.com quantal-proposed/restricted i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-proposed/main i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-proposed/multiverse i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Err http://us.archive.ubuntu.com quantal-proposed/universe i386 Packages
404 Not Found [IP: 91.189.91.14 80]
Ign http://us.archive.ubuntu.com quantal-proposed/main Translation-en_US
Ign http://us.archive.ubuntu.com quantal-proposed/main Translation-en
Ign http://us.archive.ubuntu.com quantal-proposed/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com quantal-proposed/multiverse Translation-en
Ign http://us.archive.ubuntu.com quantal-proposed/restricted Translation-en_US
Ign http://us.archive.ubuntu.com quantal-proposed/restricted Translation-en
Ign http://us.archive.ubuntu.com quantal-proposed/universe Translation-en_US
Ign http://us.archive.ubuntu.com quantal-proposed/universe Translation-en
Fetched 104 kB in 1min 56s (892 B/s)
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/main/source/Sources 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/restricted/source/Sources 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/universe/source/Sources 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/multiverse/source/Sources 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/main/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/restricted/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/universe/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/multiverse/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/main/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/restricted/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/universe/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/multiverse/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/main/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/restricted/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/universe/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/multiverse/source/Sources 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-proposed/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-proposed/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-proposed/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-proposed/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
Then I tried to re-install Okular but again getting same errors. I have tried changing software source to Main Server and also enabled authentication for third party software sources but still no progress.
Ubuntu 12.10 is not supported any more since May 2014. You either need to update to a more recent version of Ubuntu (i.e. 14.04), or find an alternative repository. The alternative repository for 12.10 is released here (thanks @rubo77 for finding it). More information on upgrading can be found here.
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