[Bug 1309236] Re: E: GPG error: http://extras.ubuntu.com trusty InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

[Chris Bainbridge]

*** This bug is a duplicate of bug 1320466 ***
    https://bugs.launchpad.net/bugs/1320466

** This bug has been marked a duplicate of bug 1320466
   unable to make any update from sudan unless we use VPN connection

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Title:
  E: GPG error: http://extras.ubuntu.com trusty InRelease: Clearsigned
  file isn't valid, got 'NODATA' (does the network require
  authentication?)

Status in “apt” package in Ubuntu:
  Incomplete

Bug description:
  I can't update and install any programm on Ubuntu 14.04 trusty

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