[Bug 1311652] Re: Error during update

[Wei Mu]

According to the rsync man page, rsync does not cause hash-checksum-mismatch problem, because rsync uses atomic operations for files by default.
So if mismatch problem occurs, there might two reasons:
* Network caching problem in http  (for users of Ubuntu)
* Some serious problem with upstream mirror or disk (for mirror sites)
 
In most occasions, network caching is the reason for this problem.
Some ISPs are using network caching machanism to redirect frequent downloaded links.
If you use wget to repeat the process,  you may see a 302 redirection, then this might be the reason for the problem.
Try to use another mirror until everything looks fine.

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https://bugs.launchpad.net/bugs/1311652

Title:
  Error during update

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Confirmed

Bug description:
  W:Failed to fetch gzip:/var/lib/apt/lists/partial/mirror.as29550.net_archive.ubuntu.com_dists_trusty_main_binary-i386_Packages  Hash Sum mismatch
  , W:Failed to fetch gzip:/var/lib/apt/lists/partial/mirror.as29550.net_archive.ubuntu.com_dists_trusty_universe_binary-i386_Packages  Hash Sum mismatch
  , E:Some index files failed to download. They have been ignored, or old ones used instead.

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