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dinesh@dinesh-XPS15z:~$ sudo nano /etc/apt/sources.list
[sudo] password for dinesh: 
dinesh@dinesh-XPS15z:~$ sudo nano /etc/apt/sources.list
dinesh@dinesh-XPS15z:~$ sudo apt-get update
Get:1 ftp: //ftp.iitm.ac.in oneiric InRelease
Ign ftp:// ftp.iitm.ac.in oneiric InRelease                                     
Get:2 ftp:// ftp.iitm.ac.in oneiric-updates InRelease                           
Ign ftp:// ftp.iitm.ac.in oneiric-updates InRelease                             
Get:3 ftp:// ftp.iitm.ac.in oneiric-security InRelease                          
Ign ftp:// ftp.iitm.ac.in oneiric-security InRelease                            
Get:4 ftp:// ftp.iitm.ac.in oneiric-proposed InRelease                          
Ign ftp:// ftp.iitm.ac.in oneiric-proposed InRelease                            
Get:5 ftp:// f tp.iitm.ac.in oneiric-backports InRelease                         
Ign  ft p://ft p.iitm.ac.in oneiric-backports InRelease                           
Get:6 f tp://f tp.iitm.ac.in oneiric Release.gpg [198 B]                         
Get:7 f tp://ft p.iitm.ac.in oneiric-updates Release.gpg [198 B]                 
Get:8 f tp://f tp.iitm.ac.in oneiric-security Release.gpg [198 B]                
Hit ft p://ft p.iitm.ac.in oneiric-proposed Release.gpg                          
Hit ft p://ft p.  iitm.ac.in oneiric-backports Release.gpg                         
Hit ft p://ft p.i  itm.ac.in oneiric Release                                       
Hit ft p://f tp.ii tm.ac.in oneiric-updates Release                               
Hit ft p://ft p.iitm.ac.in oneiric-security Release                              
Hit ft p://ft p .i itm.ac.in oneiric-proposed Release                              
Hit ft p://f tp.iitm.ac.in oneiric-backports Release                             
Hit ft p://f tp.iitm.ac.in oneiric/main i386 Packages                            
Hit ft p://f tp.i itm.ac.in oneiric/restricted i386 Packages                      
Hit ft p://f tp.iitm.ac.in oneiric/multiverse i386 Packages                      
Hit ft p://f tp.i itm.ac.in oneiric/universe i386 Packages                        
Hit ft p://f t p.ii tm.ac.in oneiric/main TranslationIndex                         
Hit ft p://f tp.iit m.ac.in oneiric/multiverse TranslationIndex                   
Hit ft p://f tp.iitm .ac.in oneiric/restricted TranslationIndex                   
Hit ft p://f tp.iitm. ac.in oneiric/universe TranslationIndex                     
Hit ft p://f tp.iitm.a c.in oneiric-updates/restricted i386 Packages              
Hit ft p://f tp.iitm.ac .in oneiric-updates/multiverse i386 Packages              
Hit ft p://f tp.iitm.ac. in oneiric-updates/universe i386 Packages                
Hit ft p://f tp.iitm.ac.in oneiric-updates/multiverse TranslationIndex           
Hit ft p://f tp.iitm.ac.i n oneiric-updates/restricted TranslationIndex           
Hit ft p://f tp.iitm.ac.in  oneiric-updates/universe TranslationIndex             
Hit ft p://ft p.iitm.ac.in  oneiric/main Translation-en                           
Hit ft p://f tp.iitm.ac.in oneiric/multiverse Translation-en                     
Hit ft p://f tp.iitm.ac.in oneiric/restricted Translation-en                     
Hit ft p://f tp.iitm.ac.in oneiric/universe Translation-en                       
Hit ft  p://f tp.iitm.ac.in oneiric-security/restricted i386 Packages             
Hit ft p://f tp.iitm.ac.in oneiric-security/multiverse i386 Packages             
Hit ft p://f tp.iitm.ac.in oneiric-security/universe i386 Packages               
Hit ft p://ft p.iitm.ac.in oneiric-security/multiverse TranslationIndex          
Hit ft p://f tp.iitm.ac.in oneiric-security/restricted TranslationIndex          
Hit ft p://f tp.iitm.ac.in oneiric-security/universe TranslationIndex            
Hit ft p://f tp.iitm.ac.in oneiric-updates/multiverse Translation-en             
Hit ft p://f tp.iitm.ac.in oneiric-proposed/restricted i386 Packages             
Hit ft p://f tp.iitm.ac.in oneiric-proposed/multiverse i386 Packages             
Hit ft p://f tp.iitm.ac.in oneiric-proposed/universe i386 Packages               
Hit ft p://f tp.iitm.ac.in oneiric-proposed/multiverse TranslationIndex          
Hit ft p://f tp.iitm.ac.in oneiric-proposed/restricted TranslationIndex          
Hit f tp ://f tp.iitm.ac.in oneiric-proposed/universe TranslationIndex            
Hit f tp ://f tp.iitm.ac.in oneiric-updates/restricted Translation-en             
Hit ft p ://f tp.iitm.ac.in oneiric-backports/restricted i386 Packages            
Hit f tp://f tp.iitm.ac.in oneiric-backports/multiverse i386 Packages            
Hit f tp://f tp.iitm.ac.in oneiric-backports/universe i386 Packages              
Hit f tp://f tp.iitm.ac.in oneiric-backports/multiverse TranslationIndex         
Hit f tp://f tp.iitm.ac.in oneiric-backports/restricted TranslationIndex         
Hit ft p://f tp.iitm.ac.in oneiric-backports/universe TranslationIndex           
Hit f tp://f tp.iitm.ac.in oneiric-updates/universe Translation-en               
Hit f tp://f tp.iitm.ac.in oneiric-security/multiverse Translation-en            
Hit f tp://f tp.iitm.ac.in oneiric-security/restricted Translation-en            
Hit f tp://f tp.iitm.ac.in oneiric-security/universe Translation-en              
Hit f tp://f tp.iitm.ac.in oneiric-proposed/multiverse Translation-en            
Hit f tp://f tp.iitm.ac.in oneiric-proposed/restricted Translation-en            
Hit f tp://f tp.iitm.ac.in oneiric-proposed/universe Translation-en              
Hit f tp://f tp.iitm.ac.in oneiric-backports/multiverse Translation-en           
Hit ftp://f tp.iitm.ac.in oneiric-backports/restricted Translation-en           
Hit f tp://f tp.iitm.ac.in oneiric-backports/universe Translation-en             
Err h tt p:// ppa.launchpad.net oneiric InRelease                                 

Err htt p://ppa.launchpad.net oneiric InRelease                                 

Err htt p://ppa.launchpad.net oneiric Release.gpg                               
  Unable to connect to ppa.launchpad.net:http:
Err htt p://ppa.launchpad.net oneiric Release.gpg                               
  Unable to connect to ppa.launchpad.net:http:
Err ht tp://archive.canonical.com oneiric InRelease                                                         

Err htt p://archive.canonical.com oneiric Release.gpg                                                       
  Unable to connect to archive.canonical.com:http: [IP: 91.189.92.191 80]
98% [Connecting to archive.ubuntu.com (91.189.88.26)]^Cdinesh@dinesh-XPS15z:~$ 

Any ideas?

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1 Answer 1

You did an update of system rather than upgrade.If you want to upgrade to 12.04, run the update manager and do the pending updation.Run again,then u could see "new release available" and do click "upgrade" and follow the instructions.I think this will help you.

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