[Bug 818448] Re: Not able to update or upgrade using sudo apt-get

[RedSingularity]

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** Changed in: apt (Ubuntu)
       Status: New => Invalid

** Converted to question:
   https://answers.launchpad.net/ubuntu/+source/apt/+question/166493

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https://bugs.launchpad.net/bugs/818448

Title:
  Not able to update or upgrade using sudo apt-get

Status in “apt” package in Ubuntu:
  Invalid

Bug description:
  i am not able to upgrade or update in terminal. it is showing
  following error:

  W: GPG error: http://archive.canonical.com natty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster at ubuntu.com>
  W: GPG error: http://ppa.launchpad.net natty Release: The following signatures were invalid: BADSIG 9ED9A781DD9300F1 Launchpad PPA for Артём Попов
  W: Failed to fetch bzip2:/var/lib/apt/lists/partial/archive.canonical.com_dists_natty_partner_binary-i386_Packages  Hash Sum mismatch

  W: Failed to fetch http://ppa.launchpad.net/lorenzo-
  carbonell/atareao/ubuntu/dists/natty/main/source/Sources  404  Not
  Found

  W: Failed to fetch http://ppa.launchpad.net/lorenzo-
  carbonell/atareao/ubuntu/dists/natty/main/binary-i386/Packages  404
  Not Found

  E: Some index files failed to download. They have been ignored, or old
  ones used instead.

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