Ign http://archive.canonical.com trusty InRelease
Hit http://ppa.launchpad.net trusty InRelease                                  
Ign http://extras.ubuntu.com trusty InRelease                                  
Hit http://ppa.launchpad.net trusty InRelease                                  
Get:1 http://extras.ubuntu.com trusty Release.gpg [72 B]                       
Get:2 http://archive.canonical.com trusty Release.gpg [933 B]                  
Hit http://extras.ubuntu.com trusty Release                                    
Get:3 http://dl.google.com stable InRelease [1,540 B]                          
99% [3 InRelease gpgv 1,540 B] [Connecting to ca.archive.ubuntu.com (91.189.88.Splitting up /var/lib/apt/lists/partial/dl.google.com_linux_talkplugin_deb_dists_Ign 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?)