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During the past week, I am having problems with "hash sum mismatch". I keep getting hash sum mismatch regardless of the update source/server used. This is involving the following:

W: Failed to fetch ... //archive.canonical.com/ubuntu/dists/trusty/partner/binary-amd64/Packages  Hash Sum mismatch
W: Failed to fetch ... //archive.canonical.com/ubuntu/dists/trusty/partner/binary-i386/Packages  Hash Sum mismatch
W: Failed to fetch ... //archive.ubuntu.com/ubuntu/dists/trusty-updates/main/i18n/Translation-en  Hash Sum mismatch
W: Failed to fetch ... //archive.ubuntu.com/ubuntu/dists/trusty-security/universe/i18n/Translation-en  Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.

There is a notice about checking the Internet connection. It doesn't matter which update server I used. I get the same results.

I have cleared out the var/lib/apt/lists and run apt-get update in the terminal but no change. I have also a dir/file of /var/lib/apt/lists.old. Do I or can I delete/remove this dir/file?

How can I fix it?

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  • How did you cleared out the var/lib/apt/lists. I mean which command did you run?
    – g_p
    Jan 25, 2015 at 7:40

1 Answer 1

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Sometimes the data doesn't match the checksum. This could be because you requested it at the exact wrong time, but it could also mean network errors. I have seen this many time and just waiting a few minutes and trying again usually works just fine.

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  • I used Terminal (sudo su) to "rm" the partial file/directory and the "lists" file/directory. Still getting "Failed to download repository information -- Check the Internet connection". I have tried different update servers to no avail.
    – user250630
    Jan 27, 2015 at 2:34

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