Ubuntu Version:12:04 Xubuntu
1.... i have done changing my server to main server and server to india , but both are not given any solution to this issue .

2...removed all things in lists at apt & updated but not worked .

3...i know one more thing is unchecking check boxes at update manager --> settings --> other software tab ...but i dont want to do that because i want that webupd8 ppa to install themes for my gnome-shell(i have installed).

Help me guys ! i did all what i know

Code:
assassin@raju-xubuntu:~$ sudo apt-get update
[sudo] password for assassin: 
Ign http://in.archive.ubuntu.com precise InRelease
Ign http://in.archive.ubuntu.com precise-updates InRelease                     
Ign http://in.archive.ubuntu.com precise-backports InRelease                   
Ign http://deb.opera.com stable InRelease                                      
Ign http://dl.google.com stable InRelease                                      
Ign http://in.archive.ubuntu.com precise-security InRelease                    
Ign http://ppa.launchpad.net oneiric InRelease                                 
Ign http://ppa.launchpad.net oneiric InRelease                                 
Ign http://ppa.launchpad.net precise InRelease                                 
Get:1 http://in.archive.ubuntu.com precise Release.gpg [198 B]                 
Ign http://extras.ubuntu.com precise InRelease                                 
Hit http://deb.opera.com stable Release.gpg                                    
Hit http://in.archive.ubuntu.com precise-updates Release.gpg                   
Hit http://in.archive.ubuntu.com precise-backports Release.gpg                 
Hit http://ppa.launchpad.net oneiric Release.gpg                               
Ign http://extras.ubuntu.com precise Release.gpg                               
Hit http://deb.opera.com stable Release                                        
Hit http://in.archive.ubuntu.com precise-security Release.gpg                  
Hit http://ppa.launchpad.net oneiric Release.gpg                               
Ign http://extras.ubuntu.com precise Release                                   
Get:2 http://in.archive.ubuntu.com precise Release [49.6 kB]                   
Ign http://ppa.launchpad.net precise Release.gpg                               
Hit http://deb.opera.com stable/non-free i386 Packages                         
Hit http://ppa.launchpad.net oneiric Release                                   
Ign http://deb.opera.com stable/non-free TranslationIndex                      
Ign http://extras.ubuntu.com precise/main TranslationIndex                     
Get:3 http://dl.google.com stable Release.gpg [198 B]                          
Hit http://ppa.launchpad.net oneiric Release                                   
Ign http://ppa.launchpad.net precise Release                                   
Hit http://ppa.launchpad.net oneiric/main Sources                              
Hit http://ppa.launchpad.net oneiric/main i386 Packages                        
Ign http://ppa.launchpad.net oneiric/main TranslationIndex                     
Hit http://ppa.launchpad.net oneiric/main Sources                              
Hit http://ppa.launchpad.net oneiric/main i386 Packages                        
Ign http://ppa.launchpad.net oneiric/main TranslationIndex                     
Ign http://ppa.launchpad.net precise/main TranslationIndex                     
Hit http://in.archive.ubuntu.com precise-updates Release                       
Hit http://in.archive.ubuntu.com precise-backports Release                     
Hit http://in.archive.ubuntu.com precise-security Release                      
Get:4 http://in.archive.ubuntu.com precise/main Sources [899 kB]               
Err http://extras.ubuntu.com precise/main Sources                              
  404  Not Found
Get:5 http://dl.google.com stable Release [1,347 B]                            
Err http://extras.ubuntu.com precise/main i386 Packages                        
  404  Not Found
Ign http://deb.opera.com stable/non-free Translation-en_IN                     
Ign http://extras.ubuntu.com precise/main Translation-en_IN                    
Ign http://extras.ubuntu.com precise/main Translation-en                       
Ign http://deb.opera.com stable/non-free Translation-en                        
Err http://ppa.launchpad.net precise/main Sources                              
  404  Not Found
Err http://ppa.launchpad.net precise/main i386 Packages                        
  404  Not Found
Ign http://ppa.launchpad.net oneiric/main Translation-en_IN                    
Ign http://ppa.launchpad.net oneiric/main Translation-en                       
Ign http://ppa.launchpad.net oneiric/main Translation-en_IN                    
Ign http://ppa.launchpad.net oneiric/main Translation-en                     
Get:6 http://dl.google.com stable/main i386 Packages [1,221 B]               
Ign http://ppa.launchpad.net precise/main Translation-en_IN                    
Ign http://ppa.launchpad.net precise/main Translation-en                       
Ign http://dl.google.com stable/main TranslationIndex                          
Ign http://dl.google.com stable/main Translation-en_IN                         
Ign http://dl.google.com stable/main Translation-en                            
Get:7 http://in.archive.ubuntu.com precise/restricted Sources [5,338 B]        
Get:8 http://in.archive.ubuntu.com precise/universe Sources [4,894 kB]         
Get:9 http://in.archive.ubuntu.com precise/multiverse Sources [158 kB]         
Get:10 http://in.archive.ubuntu.com precise/main i386 Packages [1,255 kB]      
Get:11 http://in.archive.ubuntu.com precise/restricted i386 Packages [8,212 B] 
Get:12 http://in.archive.ubuntu.com precise/universe i386 Packages [4,611 kB]  
Get:13 http://in.archive.ubuntu.com precise/multiverse i386 Packages [124 kB]  
Get:14 http://in.archive.ubuntu.com precise/main TranslationIndex [74 B]       
Get:15 http://in.archive.ubuntu.com precise/multiverse TranslationIndex [73 B] 
Get:16 http://in.archive.ubuntu.com precise/restricted TranslationIndex [72 B] 
Get:17 http://in.archive.ubuntu.com precise/universe TranslationIndex [75 B]   
Hit http://in.archive.ubuntu.com precise-updates/main Sources                  
Hit http://in.archive.ubuntu.com precise-updates/restricted Sources            
Hit http://in.archive.ubuntu.com precise-updates/universe Sources              
Hit http://in.archive.ubuntu.com precise-updates/multiverse Sources            
Hit http://in.archive.ubuntu.com precise-updates/main i386 Packages            
Hit http://in.archive.ubuntu.com precise-updates/restricted i386 Packages      
Hit http://in.archive.ubuntu.com precise-updates/universe i386 Packages        
Hit http://in.archive.ubuntu.com precise-updates/multiverse i386 Packages      
Hit http://in.archive.ubuntu.com precise-updates/main TranslationIndex         
Hit http://in.archive.ubuntu.com precise-updates/multiverse TranslationIndex   
Hit http://in.archive.ubuntu.com precise-updates/restricted TranslationIndex   
Hit http://in.archive.ubuntu.com precise-updates/universe TranslationIndex     
Hit http://in.archive.ubuntu.com precise-backports/main Sources                
Hit http://in.archive.ubuntu.com precise-backports/restricted Sources          
Hit http://in.archive.ubuntu.com precise-backports/universe Sources            
Hit http://in.archive.ubuntu.com precise-backports/multiverse Sources          
Hit http://in.archive.ubuntu.com precise-backports/main i386 Packages          
Hit http://in.archive.ubuntu.com precise-backports/restricted i386 Packages    
Hit http://in.archive.ubuntu.com precise-backports/universe i386 Packages      
Hit http://in.archive.ubuntu.com precise-backports/multiverse i386 Packages    
Hit http://in.archive.ubuntu.com precise-backports/main TranslationIndex       
Hit http://in.archive.ubuntu.com precise-backports/multiverse TranslationIndex 
Hit http://in.archive.ubuntu.com precise-backports/restricted TranslationIndex 
Hit http://in.archive.ubuntu.com precise-backports/universe TranslationIndex   
Hit http://in.archive.ubuntu.com precise-security/main Sources                 
Hit http://in.archive.ubuntu.com precise-security/restricted Sources           
Hit http://in.archive.ubuntu.com precise-security/universe Sources             
Hit http://in.archive.ubuntu.com precise-security/multiverse Sources           
Hit http://in.archive.ubuntu.com precise-security/main i386 Packages           
Hit http://in.archive.ubuntu.com precise-security/restricted i386 Packages     
Hit http://in.archive.ubuntu.com precise-security/universe i386 Packages       
Hit http://in.archive.ubuntu.com precise-security/multiverse i386 Packages     
Hit http://in.archive.ubuntu.com precise-security/main TranslationIndex        
Hit http://in.archive.ubuntu.com precise-security/multiverse TranslationIndex  
Hit http://in.archive.ubuntu.com precise-security/restricted TranslationIndex  
Hit http://in.archive.ubuntu.com precise-security/universe TranslationIndex    
Hit http://in.archive.ubuntu.com precise/main Translation-en                   
Hit http://in.archive.ubuntu.com precise/multiverse Translation-en             
Hit http://in.archive.ubuntu.com precise/restricted Translation-en             
Hit http://in.archive.ubuntu.com precise/universe Translation-en               
Hit http://in.archive.ubuntu.com precise-updates/main Translation-en           
Hit http://in.archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://in.archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://in.archive.ubuntu.com precise-updates/universe Translation-en
Hit http://in.archive.ubuntu.com precise-backports/main Translation-en
Hit http://in.archive.ubuntu.com precise-backports/multiverse Translation-en
Hit http://in.archive.ubuntu.com precise-backports/restricted Translation-en
Hit http://in.archive.ubuntu.com precise-backports/universe Translation-en
Hit http://in.archive.ubuntu.com precise-security/main Translation-en
Hit http://in.archive.ubuntu.com precise-security/multiverse Translation-en
Hit http://in.archive.ubuntu.com precise-security/restricted Translation-en
Hit http://in.archive.ubuntu.com precise-security/universe Translation-en
Fetched 12.0 MB in 3min 27s (57.9 kB/s)
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/source/Sources  404  Not Found

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/webupd8team/themes/ubuntu/dists/precise/main/source/Sources  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/webupd8team/themes/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.
assassin@raju-xubuntu:~$
Thanks in advance