Ubuntu – How to fix APT errors “W: Failed to fetch […] Hash Sum mismatch”


I don't really know what happened, after reboot I got many crash messages, and if I would open Firefox or Synaptic, they would crash. Synaptic returns this:

E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_main_i18n_Translation-en
E: The package lists or status file could not be parsed or opened.
E: _cache->open() failed, please report.

Then crash icon on the top panel appeared, and there was some error about mergelist. I googled, and found this sudo rm /var/lib/apt/lists/* -vf sudo apt-get update That didn't work. To be able to work in browser I deleted all files in /var/lib/apt/lists. If I try sudo apt-get update, I get this:

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ua.archive.ubuntu.com_ubuntu_dists_raring_main_source_Sources Hash Sum mismatch
W: Failed to fetch gzip:/var/lib/apt/lists/partial/ua.archive.ubuntu.com_ubuntu_dists_raring_restricted_source_Sources Hash Sum mismatch
W: Failed to fetch gzip:/var/lib/apt/lists/partial/ua.archive.ubuntu.com_ubuntu_dists_raring_universe_source_Sources Hash Sum mismatch
W: Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_raring-security_main_source_Sources Hash Sum mismatch
W: Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_raring-security_universe_source_Sources Hash Sum mismatch
W: Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_raring-security_main_binary-i386_Packages Hash Sum mismatch
W: Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_raring-security_universe_binary-i386_Packages Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.

I do not want to reinstall the system. How could I fix that? Thanks.

Some photos there. I can't make screenshots, it crashes: Photo 1 Photo 2

Best Answer

The problem is that you deleted recursively /var/lib/apt/lists, which deleted the partial directory too. So, recreating the directory should solve the issue:

sudo mkdir -p /var/lib/apt/lists/partial
sudo chmod 755 /var/lib/apt/lists/partial

Also, is possible that the mirror you are using have problems. Select another mirror and update again.

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