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This is what i get when i run sudo apt-get update:

Ign http://ppa.launchpad.net quantal InRelease                                 
Ign http://ppa.launchpad.net quantal InRelease                                 
Get:1 http://dl.google.com stable InRelease [1,540 B]                          
Ign http://archive.ubuntu.com quantal InRelease                                
Ign http://ppa.launchpad.net quantal InRelease                                 
Ign http://extras.ubuntu.com quantal InRelease                                 
Ign http://archive.ubuntu.com quantal-updates InRelease                        
Ign http://archive.canonical.com quantal InRelease                             
Hit http://dl.google.com stable Release.gpg                                    
Ign http://archive.ubuntu.com quantal-backports InRelease                      
Hit http://ppa.launchpad.net quantal Release.gpg                               
Hit http://extras.ubuntu.com quantal Release.gpg                               
Ign http://archive.canonical.com quantal InRelease                             
Ign http://archive.ubuntu.com quantal-security InRelease                       
Hit http://dl.google.com stable Release                                        
Hit http://ppa.launchpad.net quantal Release.gpg                               
Hit http://extras.ubuntu.com quantal Release                                   
Ign http://archive.ubuntu.com quantal-proposed InRelease                       
Hit http://archive.canonical.com quantal Release.gpg                 
Hit http://archive.ubuntu.com quantal Release.gpg                    
Hit http://ppa.launchpad.net quantal Release.gpg                     
Hit http://extras.ubuntu.com quantal/main Sources                    
Get:2 http://archive.ubuntu.com quantal-updates Release.gpg [933 B]  
Hit http://archive.canonical.com quantal Release.gpg                           
Hit http://ppa.launchpad.net quantal Release                         
Hit http://archive.ubuntu.com quantal-backports Release.gpg                    
Hit http://extras.ubuntu.com quantal/main i386 Packages                        
Hit http://archive.canonical.com quantal Release                     
Hit http://archive.ubuntu.com quantal-security Release.gpg                     
Hit http://ppa.launchpad.net quantal Release                                   
Get:3 http://archive.ubuntu.com quantal-proposed Release.gpg [933 B]           
Hit http://archive.canonical.com quantal Release                               
Hit http://ppa.launchpad.net quantal Release                                   
Hit http://archive.ubuntu.com quantal Release                                  
Hit http://archive.canonical.com quantal/partner Sources                       
Get:4 http://archive.ubuntu.com quantal-updates Release [49.6 kB]              
Hit http://ppa.launchpad.net quantal/main Sources                              
Hit http://archive.canonical.com quantal/partner i386 Packages                 
Hit http://ppa.launchpad.net quantal/main i386 Packages                        
Hit http://archive.ubuntu.com quantal-backports Release                        
Hit http://archive.ubuntu.com quantal-security Release                         
Hit http://archive.canonical.com quantal/partner Sources                       
Get:5 http://archive.ubuntu.com quantal-proposed Release [49.6 kB]             
Hit http://ppa.launchpad.net quantal/main Sources                              
Hit http://archive.canonical.com quantal/partner i386 Packages                 
Hit http://ppa.launchpad.net quantal/main i386 Packages                        
Ign http://extras.ubuntu.com quantal/main Translation-en_US                    
Ign http://extras.ubuntu.com quantal/main Translation-en                       
Hit http://archive.ubuntu.com quantal/main Sources                             
Hit http://archive.ubuntu.com quantal/restricted Sources              
Hit http://ppa.launchpad.net quantal/main Sources
Hit http://archive.ubuntu.com quantal/universe Sources
Hit http://ppa.launchpad.net quantal/main i386 Packages
Hit http://archive.ubuntu.com quantal/multiverse Sources
Hit http://archive.ubuntu.com quantal/main i386 Packages              
Hit http://archive.ubuntu.com quantal/restricted i386 Packages                 
Hit http://archive.ubuntu.com quantal/universe i386 Packages                   
Hit http://archive.ubuntu.com quantal/multiverse i386 Packages                 
Hit http://archive.ubuntu.com quantal/main Translation-en                      
Hit http://archive.ubuntu.com quantal/multiverse Translation-en                
Hit http://archive.ubuntu.com quantal/restricted Translation-en                
Ign http://archive.canonical.com quantal/partner Translation-en_US             
Hit http://archive.ubuntu.com quantal/universe Translation-en                  
Ign http://archive.canonical.com quantal/partner Translation-en                
Get:6 http://archive.ubuntu.com quantal-updates/main Sources [50.9 kB]         
Ign http://archive.canonical.com quantal/partner Translation-en_US             
Ign http://archive.canonical.com quantal/partner Translation-en                
Get:7 http://archive.ubuntu.com quantal-updates/restricted Sources [889 B]     
Get:8 http://archive.ubuntu.com quantal-updates/universe Sources [22.2 kB]     
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                    
Get:9 http://archive.ubuntu.com quantal-updates/multiverse Sources [2,940 B]   
Get:10 http://archive.ubuntu.com quantal-updates/main i386 Packages [127 kB]   
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                       
Get:11 http://archive.ubuntu.com quantal-updates/restricted i386 Packages [1,979 B]
Get:12 http://archive.ubuntu.com quantal-updates/universe i386 Packages [67.5 kB]
Get:13 http://archive.ubuntu.com quantal-updates/multiverse i386 Packages [8,121 B]
Hit http://archive.ubuntu.com quantal-updates/main Translation-en              
Hit http://archive.ubuntu.com quantal-updates/multiverse Translation-en        
Hit http://archive.ubuntu.com quantal-updates/restricted Translation-en        
Hit http://archive.ubuntu.com quantal-updates/universe Translation-en          
Hit http://archive.ubuntu.com quantal-backports/main Sources                   
Hit http://archive.ubuntu.com quantal-backports/restricted Sources             
Hit http://archive.ubuntu.com quantal-backports/universe Sources               
Hit http://archive.ubuntu.com quantal-backports/multiverse Sources             
Hit http://archive.ubuntu.com quantal-backports/main i386 Packages             
Hit http://archive.ubuntu.com quantal-backports/restricted i386 Packages       
Hit http://archive.ubuntu.com quantal-backports/universe i386 Packages         
Hit http://archive.ubuntu.com quantal-backports/multiverse i386 Packages       
Hit http://archive.ubuntu.com quantal-backports/main Translation-en            
Hit http://archive.ubuntu.com quantal-backports/multiverse Translation-en      
Hit http://archive.ubuntu.com quantal-backports/restricted Translation-en      
Hit http://archive.ubuntu.com quantal-backports/universe Translation-en        
Hit http://archive.ubuntu.com quantal-security/main Sources                    
Hit http://archive.ubuntu.com quantal-security/restricted Sources              
Hit http://archive.ubuntu.com quantal-security/universe Sources                
Hit http://archive.ubuntu.com quantal-security/multiverse Sources              
Hit http://archive.ubuntu.com quantal-security/main i386 Packages              
Hit http://archive.ubuntu.com quantal-security/restricted i386 Packages        
Hit http://archive.ubuntu.com quantal-security/universe i386 Packages          
Hit http://archive.ubuntu.com quantal-security/multiverse i386 Packages        
Hit http://archive.ubuntu.com quantal-security/main Translation-en             
Hit http://archive.ubuntu.com quantal-security/multiverse Translation-en
Hit http://archive.ubuntu.com quantal-security/restricted Translation-en
Hit http://archive.ubuntu.com quantal-security/universe Translation-en
Get:14 http://archive.ubuntu.com quantal-proposed/restricted i386 Packages [14 B]
Get:15 http://archive.ubuntu.com quantal-proposed/main i386 Packages [40.2 kB]
Get:16 http://archive.ubuntu.com quantal-proposed/multiverse i386 Packages [14 B]
Get:17 http://archive.ubuntu.com quantal-proposed/universe i386 Packages [81.3 kB]
Hit http://archive.ubuntu.com quantal-proposed/main Translation-en
Hit http://archive.ubuntu.com quantal-proposed/multiverse Translation-en
Hit http://archive.ubuntu.com quantal-proposed/restricted Translation-en
Hit http://archive.ubuntu.com quantal-proposed/universe Translation-en
Ign http://archive.ubuntu.com quantal/main Translation-en_US                   
Ign http://archive.ubuntu.com quantal/multiverse Translation-en_US
Ign http://archive.ubuntu.com quantal/restricted Translation-en_US
Ign http://archive.ubuntu.com quantal/universe Translation-en_US
Ign http://archive.ubuntu.com quantal-updates/main Translation-en_US
Ign http://archive.ubuntu.com quantal-updates/multiverse Translation-en_US
Ign http://archive.ubuntu.com quantal-updates/restricted Translation-en_US
Ign http://archive.ubuntu.com quantal-updates/universe Translation-en_US
Ign http://archive.ubuntu.com quantal-backports/main Translation-en_US
Ign http://archive.ubuntu.com quantal-backports/multiverse Translation-en_US
Ign http://archive.ubuntu.com quantal-backports/restricted Translation-en_US
Ign http://archive.ubuntu.com quantal-backports/universe Translation-en_US
Ign http://archive.ubuntu.com quantal-security/main Translation-en_US
Ign http://archive.ubuntu.com quantal-security/multiverse Translation-en_US
Ign http://archive.ubuntu.com quantal-security/restricted Translation-en_US
Ign http://archive.ubuntu.com quantal-security/universe Translation-en_US
Ign http://archive.ubuntu.com quantal-proposed/main Translation-en_US
Ign http://archive.ubuntu.com quantal-proposed/multiverse Translation-en_US
Ign http://archive.ubuntu.com quantal-proposed/restricted Translation-en_US
Ign http://archive.ubuntu.com quantal-proposed/universe Translation-en_US
Fetched 506 kB in 45s (11.0 kB/s)
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release
Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file)
E: Some index files failed to download. They have been ignored, or old ones used instead.

As I am a noob to Ubuntu, can you give me a step by step advice for dummies, please?

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2 Answers 2

Hi I had a similar problem about this and as I have already posted here on another post ("Failed to fetch" 404 Not Found, why?) I wrote the steps used to resolve this problem (at least for me) on my blog
Regards

share|improve this answer
    
Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. –  amc Feb 10 at 3:47

I had same kind of problem with apt-get update:

-PC:~$ sudo apt-get update
Ign cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012) dists/oneiric/main/binary-i386/ InRelease
Ign cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012) dists/oneiric/main/binary-i386/ Release.gpg
Ign cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012) dists/oneiric/main/binary-i386/ Release
Err cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012) dists/oneiric/main/binary-i386/ Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Ign cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012) dists/oneiric/main/binary-i386/ Translation-en_US
    .
    .
    .
Hit http://mirrors.nic.funet.fi oneiric-security/universe Translation-en
W: Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)/dists/oneiric/main/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

E: Some index files failed to download. They have been ignored, or old ones used instead.

I got that E: Some index files failed to download. They have been ignored, or old ones used instead.-problem solved by removing line deb cdrom:[Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)]/ dists/oneiric/main/binary-i386/ from file /etc/apt/sources.list.

First I tried remove cd-rom-thing from update manager settings, because it seemed to be reason to error and generally proposed fix to the problem, but that didn't help so I found cd-rom dependency from that sources.list-file, removed it and apt-get update works again fine!

share|improve this answer
    
This is not the case with the original posters problem. –  aquaherd Jan 17 '13 at 21:56

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