You added a PPA hoping to install an application but it is not available for your Ubuntu version and you are now stuck with the update error.

They have been ignored, or old ones used instead. W: Failed to fetch 404 Not FoundĮ: Some index files failed to download. If you try adding a PPA repository that is not available for your current Ubuntu version, you’ll see that it throws a 404 not found error. Sudo apt update Error 3: Failed to fetch with error 404 not found You can use the following commands to fix it: sudo rm -rf /var/lib/apt/lists/* The error occurs possibly because of a mismatched metadata cache between the server and your system. They have been ignored, or old ones used instead W:Failed to fetch bzip2:/var/lib/apt/lists/partial/in._ubuntu_dists_oneiric_multiverse_binary-i386_Packages Hash Sum mismatch,Į:Some index files failed to download. W:Failed to fetch bzip2:/var/lib/apt/lists/partial/in._ubuntu_dists_oneiric_restricted_binary-i386_Packages Hash Sum mismatch, If you find an error that talks about Hash Sum mismatch, the fix is the same as the one in the previous error. Use the following commands one by one: sudo rm -r /var/lib/apt/lists/* You can delete all the files in this directory and run the update again to regenerate everything afresh. When you run update in terminal, you may see an error “ problem with MergeList” like below: E:Encountered a section with no Package: header,Į:Problem with MergeList /var/lib/apt/lists/_ubuntu_dists_precise_universe_binary-i386_Packages,Į:The package lists or status file could not be parsed or opened.’įor some reasons, the file in /var/lib/apt/lists directory got corrupted. Rest of the tutorial here shows how to handle the errors that you just saw in the last few lines of the update command output.

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