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How to resolve GPG Error?

+1 vote
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I'm downloading android studio from Ubuntu PPA and if I try to run sudo apt-get update command, it is showing
E: GPG error: http://ppa.launchpad.net trusty InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?) as error. Please help me in solving this.

posted Oct 5, 2016 by Bhagyashree R

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Looks to be a proxy issue rather then android studio or ubuntu issue. Following might help

$ cd /var/lib/apt
$ sudo mv lists lists.old
$ sudo mkdir -p lists/partial
$ sudo apt-get update


Check the following link (second answer)
http://askubuntu.com/questions/474549/got-nodata-issue-nodata-does-the-network-require-authentication
I already tried this, but it is not working
Try
rm -r /var/cache/apt-cacher/*

We can only guess your problem from here (as dont have access to your system) and problem can be anywhere so would suggest to try all the solution in the provided link.

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