root@david-Lenovo-Yoga-2-Pro:/# sudo apt-get update
Ign http://us.archive.ubuntu.com trusty InRelease                              
Ign http://security.ubuntu.com trusty-security InRelease                       
Ign http://extras.ubuntu.com trusty InRelease                                  
Ign http://ppa.launchpad.net precise InRelease                                 
Ign http://us.archive.ubuntu.com trusty-updates InRelease                      
Ign http://us.archive.ubuntu.com trusty-backports InRelease                    
Hit http://security.ubuntu.com trusty-security Release.gpg                     
Hit http://extras.ubuntu.com trusty Release.gpg                                
Get:1 http://ppa.launchpad.net precise Release.gpg [316 B]                     
Ign http://www.openfoam.org trusty InRelease                         
Hit http://us.archive.ubuntu.com trusty Release.gpg                  
Hit http://security.ubuntu.com trusty-security Release                         
Hit http://extras.ubuntu.com trusty Release                                    
Get:2 http://us.archive.ubuntu.com trusty-updates Release.gpg [933 B]          
Hit http://ppa.launchpad.net precise Release                         
Ign http://www.openfoam.org trusty Release.gpg                       
Ign http://ppa.launchpad.net precise Release                                   
Hit http://us.archive.ubuntu.com trusty-backports Release.gpg                  
Hit http://extras.ubuntu.com trusty/main Sources                               
Hit http://security.ubuntu.com trusty-security/main Sources                    
Ign http://ppa.launchpad.net precise/main Sources/DiffIndex                    
Ign http://www.openfoam.org trusty Release                                     
Hit http://us.archive.ubuntu.com trusty Release                                
Hit http://extras.ubuntu.com trusty/main amd64 Packages                        
Hit http://security.ubuntu.com trusty-security/restricted Sources              
Ign http://ppa.launchpad.net precise/main amd64 Packages/DiffIndex             
Get:3 http://us.archive.ubuntu.com trusty-updates Release [63.5 kB]            
Ign http://www.openfoam.org trusty/main amd64 Packages/DiffIndex               
Hit http://extras.ubuntu.com trusty/main i386 Packages                         
Hit http://security.ubuntu.com trusty-security/universe Sources                
Ign http://ppa.launchpad.net precise/main i386 Packages/DiffIndex              
Ign http://www.openfoam.org trusty/main i386 Packages/DiffIndex                
Hit http://security.ubuntu.com trusty-security/multiverse Sources              
Hit http://security.ubuntu.com trusty-security/main amd64 Packages             
Hit http://us.archive.ubuntu.com trusty-backports Release                      
Hit http://ppa.launchpad.net precise/main Translation-en                       
Hit http://us.archive.ubuntu.com trusty/main Sources                           
Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages       
Hit http://us.archive.ubuntu.com trusty/restricted Sources                     
Hit http://ppa.launchpad.net precise/main Sources                              
Hit http://us.archive.ubuntu.com trusty/universe Sources                       
Hit http://security.ubuntu.com trusty-security/universe amd64 Packages         
Hit http://ppa.launchpad.net precise/main amd64 Packages                       
Hit http://us.archive.ubuntu.com trusty/multiverse Sources                     
Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages       
Hit http://ppa.launchpad.net precise/main i386 Packages                        
Hit http://us.archive.ubuntu.com trusty/main amd64 Packages                    
Hit http://security.ubuntu.com trusty-security/main i386 Packages              
Hit http://us.archive.ubuntu.com trusty/restricted amd64 Packages              
Hit http://security.ubuntu.com trusty-security/restricted i386 Packages        
Hit http://us.archive.ubuntu.com trusty/universe amd64 Packages                
Hit http://security.ubuntu.com trusty-security/universe i386 Packages          
Hit http://us.archive.ubuntu.com trusty/multiverse amd64 Packages              
Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages        
Hit http://us.archive.ubuntu.com trusty/main i386 Packages                     
Hit http://us.archive.ubuntu.com trusty/restricted i386 Packages               
Ign http://extras.ubuntu.com trusty/main Translation-en_US                     
Hit http://security.ubuntu.com trusty-security/main Translation-en             
Ign http://ppa.launchpad.net precise/main Translation-en_US                    
Ign http://extras.ubuntu.com trusty/main Translation-en                        
Hit http://security.ubuntu.com trusty-security/multiverse Translation-en
Hit http://us.archive.ubuntu.com trusty/universe i386 Packages                 
Hit http://security.ubuntu.com trusty-security/restricted Translation-en       
Hit http://us.archive.ubuntu.com trusty/multiverse i386 Packages               
Hit http://us.archive.ubuntu.com trusty/main Translation-en                    
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Hit http://us.archive.ubuntu.com trusty/multiverse Translation-en              
Hit http://www.openfoam.org trusty/main amd64 Packages                         
Hit http://us.archive.ubuntu.com trusty/restricted Translation-en              
Hit http://www.openfoam.org trusty/main i386 Packages                          
Hit http://us.archive.ubuntu.com trusty/universe Translation-en                
Get:4 http://us.archive.ubuntu.com trusty-updates/main Sources [206 kB]        
Ign http://www.openfoam.org trusty/main Translation-en_US                      
Ign http://www.openfoam.org trusty/main Translation-en                         
Get:5 http://us.archive.ubuntu.com trusty-updates/restricted Sources [3,433 B] 
Get:6 http://us.archive.ubuntu.com trusty-updates/universe Sources [118 kB]    
Get:7 http://us.archive.ubuntu.com trusty-updates/multiverse Sources [5,152 B] 
Get:8 http://us.archive.ubuntu.com trusty-updates/main amd64 Packages [506 kB] 
Get:9 http://us.archive.ubuntu.com trusty-updates/restricted amd64 Packages [11.8 kB]
Get:10 http://us.archive.ubuntu.com trusty-updates/universe amd64 Packages [279 kB]
Get:11 http://us.archive.ubuntu.com trusty-updates/multiverse amd64 Packages [11.9 kB]
Get:12 http://us.archive.ubuntu.com trusty-updates/main i386 Packages [493 kB] 
Get:13 http://us.archive.ubuntu.com trusty-updates/restricted i386 Packages [11.8 kB]
Get:14 http://us.archive.ubuntu.com trusty-updates/universe i386 Packages [280 kB]
Get:15 http://us.archive.ubuntu.com trusty-updates/multiverse i386 Packages [12.1 kB]
Hit http://us.archive.ubuntu.com trusty-updates/main Translation-en            
Hit http://us.archive.ubuntu.com trusty-updates/multiverse Translation-en      
Hit http://us.archive.ubuntu.com trusty-updates/restricted Translation-en      
Hit http://us.archive.ubuntu.com trusty-updates/universe Translation-en        
Hit http://us.archive.ubuntu.com trusty-backports/main Sources                 
Hit http://us.archive.ubuntu.com trusty-backports/restricted Sources           
Hit http://us.archive.ubuntu.com trusty-backports/universe Sources             
Hit http://us.archive.ubuntu.com trusty-backports/multiverse Sources           
Hit http://us.archive.ubuntu.com trusty-backports/main amd64 Packages          
Hit http://us.archive.ubuntu.com trusty-backports/restricted amd64 Packages    
Hit http://us.archive.ubuntu.com trusty-backports/universe amd64 Packages      
Hit http://us.archive.ubuntu.com trusty-backports/multiverse amd64 Packages    
Hit http://us.archive.ubuntu.com trusty-backports/main i386 Packages           
Hit http://us.archive.ubuntu.com trusty-backports/restricted i386 Packages     
Hit http://us.archive.ubuntu.com trusty-backports/universe i386 Packages       
Hit http://us.archive.ubuntu.com trusty-backports/multiverse i386 Packages     
Hit http://us.archive.ubuntu.com trusty-backports/main Translation-en          
Hit http://us.archive.ubuntu.com trusty-backports/multiverse Translation-en    
Hit http://us.archive.ubuntu.com trusty-backports/restricted Translation-en    
Hit http://us.archive.ubuntu.com trusty-backports/universe Translation-en      
Ign http://us.archive.ubuntu.com trusty/main Translation-en_US                 
Ign http://us.archive.ubuntu.com trusty/multiverse Translation-en_US           
Ign http://us.archive.ubuntu.com trusty/restricted Translation-en_US           
Ign http://us.archive.ubuntu.com trusty/universe Translation-en_US             
Fetched 2,003 kB in 33s (59.5 kB/s)                                            
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3C9A6980F827E01E