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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 enter image description here

Then after some time it shows me this error: enter image description here

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.

share|improve this question

marked as duplicate by souravc, chaskes, karel, Eric Carvalho, Radu Rădeanu Jul 19 at 18:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
I was not able to download vim-gtk for the same reason as I want to have xterm_clipboard which is possible in vim-gnome. –  charany1 Jul 19 at 3:24
    
please look the answer, askubuntu.com/questions/469185/… –  xiaodongjie Jul 19 at 3:25
    
@xiaodongjie:doing it,let's see whether it gives any result –  charany1 Jul 19 at 3:29
    
It's saying no suitable download server was found. –  charany1 Jul 19 at 3:32
    
The answers are right. 12.10 is not LTS(Long Term Service). 12.04 and 14.04 is LTS version now. I suggest you upgrade or downgrade to them. –  xiaodongjie Jul 19 at 3:41

2 Answers 2

up vote 9 down vote accepted

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.

share|improve this answer
    
so,does that means I can't download any software from now on without updating? –  charany1 Jul 19 at 3:35
    
If you find an archived repository for 12.10, you might switch to that. I looked, and could not find one. It should appear here eventually: old-releases.ubuntu.com –  noleti Jul 19 at 4:31
2  
Although the old releae for quantal is not listed, it is there: old-releases.ubuntu.com/ubuntu/dists/quantal see here for how to update your sources.list –  rubo77 Jul 25 at 8:04

As 12.10 is EOL, the repos for it have moved. Upgrade to a newer version of ubuntu (or downgrade to 12.04, though that is really not recommended) to access the normal repos. If you absolutely need to use that version of ubuntu, consider adding the archive repos, google for instructions on how to do that. In the end my answer is upgrade to 14.04, it's more stable and has support

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