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I am running eos juno on a razer blade late 2016 model . I tried to do a sudo apt-get update && upgrade on terminal

Err:13 http://in.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages             
  Hash Sum mismatch
  Hashes of expected file:
   - Filesize:396740 [weak]
   - SHA256:869bb9c17b16319836d7a130aac89e549eeb7488657b6374c19884b689a487c5
   - SHA1:dff8b40c44ef805efcf589ba33a916f7f88c38da [weak]
   - MD5Sum:f91b2998ad4c92a55f05838802d0a456 [weak]
  Hashes of received file:
   - SHA256:3bb6e57d5b785359e3004a22f92a10288522dcb59b50dc4f7c456f212869a2d0
   - SHA1:1d46dffcdce50fd18f9d2d8d0a799ff09d8802c3 [weak]
   - MD5Sum:05bbf3f0beb7304ace1596f15357954d [weak]
   - Filesize:396740 [weak]
  Last modification reported: Tue, 04 Dec 2018 01:28:06 +0000
  Release file created at: Tue, 04 Dec 2018 01:27:51 +0000 
E: Some index files failed to download. They have been ignored, or old ones used instead.
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AFAIK this happens when repositories are about or in the middle of their refreshment, you just got bad timing

  • To fix it just run:

    • sudo rm -rf /var/lib/apt/lists/*
  • The you can run

    • sudo apt update

To explain the solution

You'll remove the repo index and release files from your system. Those are updated every time you run sudo apt update

Then when you run the update they'll get populated, this time valid

Now you can continue using

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