root@ArshiaAghaei:~# apt-get update
Ign http://security.ubuntu.com trusty-security InRelease                       
Get:1 http://security.ubuntu.com trusty-security Release.gpg [933 B]           
Get:2 http://security.ubuntu.com trusty-security Release [62.0 kB]             
Get:3 http://security.ubuntu.com trusty-security/main Sources [64.4 kB]        
Get:4 http://security.ubuntu.com trusty-security/restricted Sources [2,061 B]  
Get:5 http://security.ubuntu.com trusty-security/universe Sources [17.4 kB]    
Get:6 http://security.ubuntu.com trusty-security/multiverse Sources [714 B]    
Ign http://extras.ubuntu.com trusty InRelease                                  
Get:7 http://dl.google.com stable InRelease [1,540 B]                          
100% [7 InRelease gpgv 1,540 B] [Connecting to archive.ubuntu.com] [Waiting forSplitting 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?)