arshia@ArshiaAghaei:~$ sudo apt-get update
Ign http://ppa.launchpad.net trusty InRelease
Ign http://ppa.launchpad.net trusty InRelease
Ign http://ppa.launchpad.net trusty Release.gpg
Get:1 http://ppa.launchpad.net trusty Release.gpg [316 B]
Ign http://ppa.launchpad.net trusty Release
Get:2 http://ppa.launchpad.net trusty Release [15.1 kB]
Get:3 http://dl.google.com stable InRelease [1,540 B]
100% [3 InRelease gpgv 1,540 B] [Waiting for headers] [Connecting to security.uSplitting up /var/lib/apt/lists/partial/dl.google.com_linux_chrome_deb_dists_stabIgn http://dl.google.com stable InRelease
E: GPG error: http://dl.google.com stable InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)