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When I tried to upgrade to 13.10, it was appearing on the screen while preparing to update

Third party sources disabled

Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager.

After that it was on:

W:Failed to fetch bzip2:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_saucy_universe_source_Sources  Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.
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  • Can someone please specify, where is "Software Sources" ? – user255012 Mar 5 '14 at 13:35
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First message is to prevent problems with the upgrade. All 3rd party repositories get disabled to ensure a full and sucessful upgrade.

The second indicates that there was some problem in the mirror/download of the lists. Run sudo apt-get update or change mirrors.

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Go to Software Sources and add software sources by clicking on their checkboxes. Reinstall some of them if necessary.

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