[sudo] password for parisa: 
Ign http://ir.archive.ubuntu.com precise InRelease
Ign http://ir.archive.ubuntu.com precise-updates InRelease                     
Hit http://deb.playonlinux.com precise InRelease                               
Ign http://ir.archive.ubuntu.com precise-backports InRelease                   
Hit http://ir.archive.ubuntu.com precise Release.gpg                           
Ign http://ppa.launchpad.net precise InRelease                                 
Ign http://security.ubuntu.com precise-security InRelease                      
Ign http://extras.ubuntu.com precise InRelease                                 
Hit http://ir.archive.ubuntu.com precise-updates Release.gpg                   
Hit http://deb.playonlinux.com precise/main amd64 Packages                     
Hit http://ir.archive.ubuntu.com precise-backports Release.gpg                 
Get:1 http://dl.google.com stable InRelease [1,540 B]                          
99% [1 InRelease gpgv 1,540 B] [Connecting to archive.ubuntu.com] [Waiting for Splitting 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?)