[Bug 803040] Re: Cannot update or install packages

[nithin_aneesh]

This problem is not only faced by me. This is the output from my friends
laptop:

sudo apt-get update
Ign http://archive.canonical.com natty InRelease
Ign http://in.archive.ubuntu.com natty InRelease                               
Ign http://ppa.launchpad.net natty InRelease                                   
Ign http://archive.ubuntu.com natty InRelease                                  
Ign http://extras.ubuntu.com natty InRelease                                   
Hit http://archive.canonical.com natty Release.gpg                             
Ign http://in.archive.ubuntu.com natty-updates InRelease                       
Ign http://ppa.launchpad.net natty InRelease                                   
Hit http://archive.ubuntu.com natty Release.gpg                                
Hit http://archive.canonical.com natty Release                                 
Ign http://in.archive.ubuntu.com natty-security InRelease                      
Ign http://ppa.launchpad.net natty InRelease                                   
Hit http://archive.ubuntu.com natty Release                                    
Ign http://in.archive.ubuntu.com natty-proposed InRelease                      
Hit http://extras.ubuntu.com natty Release.gpg                                 
Get:1 http://ppa.launchpad.net natty Release.gpg [316 B]                       
Hit http://archive.canonical.com natty/partner Sources                         
Hit http://archive.ubuntu.com natty/main Sources                               
Hit http://in.archive.ubuntu.com natty Release.gpg                             
Get:2 http://ppa.launchpad.net natty Release.gpg [316 B]                       
Hit http://archive.canonical.com natty/partner amd64 Packages                  
Hit http://archive.ubuntu.com natty/restricted Sources                         
Hit http://in.archive.ubuntu.com natty-updates Release.gpg                     
Hit http://ppa.launchpad.net natty Release.gpg                                 
Ign http://archive.canonical.com natty/partner TranslationIndex                
Hit http://extras.ubuntu.com natty Release                                     
Hit http://in.archive.ubuntu.com natty-security Release.gpg                    
Get:3 http://ppa.launchpad.net natty Release [9,757 B]                         
Ign http://ppa.launchpad.net natty Release                                     
Hit http://in.archive.ubuntu.com natty-proposed Release.gpg                    
Get:4 http://ppa.launchpad.net natty Release [9,736 B]                         
Ign http://ppa.launchpad.net natty Release                                     
Hit http://in.archive.ubuntu.com natty Release                                 
Hit http://ppa.launchpad.net natty Release                                     
Hit http://extras.ubuntu.com natty/main Sources                                
Hit http://in.archive.ubuntu.com natty-updates Release                         
Ign http://ppa.launchpad.net natty/main Sources/DiffIndex                      
Hit http://in.archive.ubuntu.com natty-security Release                        
Ign http://ppa.launchpad.net natty/main amd64 Packages/DiffIndex               
Hit http://in.archive.ubuntu.com natty-proposed Release                        
Ign http://ppa.launchpad.net natty/main TranslationIndex                       
Hit http://extras.ubuntu.com natty/main amd64 Packages                         
Hit http://in.archive.ubuntu.com natty/restricted Sources                      
Hit http://ppa.launchpad.net natty/main Sources/DiffIndex                      
W: GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C0B56813051D8B58
W: GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A6804EA8EAE0D85C
E: Could not open file /var/lib/apt/lists/ppa.launchpad.net_n-muench_burg_ubuntu_dists_natty_main_source_Sources.IndexDiff - open (2: No such file or directory)

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https://bugs.launchpad.net/bugs/803040

Title:
  Cannot update or install packages

Status in “apt” package in Ubuntu:
  New

Bug description:
  I am using ubuntu 11.04 and I am unable to install packages from the
  universe multiverse main extras. I have enabled these repositories but
  while reloading package information it is telling a Hashsum mismatch.
  I tried changing the download server, using command line apt-get
  update apt-getclean etc but it didnt solve the issue

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