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]             
Ign http://ppa.launchpad.net trusty InRelease                                  
Get:3 http://dl.google.com stable InRelease [1,540 B]                          
41% [3 InRelease gpgv 1,540 B] [Connecting to us.archive.ubuntu.com] [2 ReleaseSplitting 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?)
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?