arshia@ArshiaAghaei:~$ sudo apt-get update
[sudo] password for arshia:
Ign http://ir.archive.ubuntu.com trusty InRelease
Ign http://ir.archive.ubuntu.com trusty-updates InRelease
Ign http://ir.archive.ubuntu.com trusty-backports InRelease
Get:1 http://ir.archive.ubuntu.com trusty Release.gpg [933 B]
Ign http://ppa.launchpad.net trusty InRelease
Get:2 http://ir.archive.ubuntu.com trusty-updates Release.gpg [933 B]
Get:3 http://ir.archive.ubuntu.com trusty-backports Release.gpg [933 B]
Ign http://ppa.launchpad.net trusty Release.gpg
Get:4 http://ir.archive.ubuntu.com trusty Release [58.5 kB]
Ign http://ppa.launchpad.net trusty Release
Get:5 http://ir.archive.ubuntu.com trusty-updates Release [62.0 kB]
Get:6 http://ir.archive.ubuntu.com trusty-backports Release [62.0 kB]
Get:7 http://ir.archive.ubuntu.com trusty/main Sources [1,064 kB]
Ign http://security.ubuntu.com trusty-security InRelease
Ign http://extras.ubuntu.com trusty InRelease
Get:8 http://security.ubuntu.com trusty-security Release.gpg [933 B]
Hit http://extras.ubuntu.com trusty Release.gpg
Get:9 http://security.ubuntu.com trusty-security Release [62.0 kB]
Hit http://extras.ubuntu.com trusty Release
Get:10 http://dl.google.com stable InRelease [1,540 B]
Hit http://extras.ubuntu.com trusty/main Sources
25% [10 InRelease gpgv 1,540 B] [7 Sources 124 kB/1,064 kB 12%] [9 Release 17.2Splitting 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?)