todd@todd-desktop:~$ sudo echo 'deb http://www.virtualbox.org/debian gutsy non-free' >> /etc/apt/sources.list
bash: /etc/apt/sources.list: Permission denied
todd@todd-desktop:~$ gksudo gedit /etc/apt/sources.list
todd@todd-desktop:~$ sudo apt-get update
Get:1 http://archive.canonical.com gutsy Release.gpg [191B]
Ign http://archive.canonical.com gutsy/partner Translation-en_US               
Get:2 http://www.virtualbox.org gutsy Release.gpg [189B]                       
Ign http://www.virtualbox.org gutsy/non-free Translation-en_US                 
Get:3 http://us.archive.ubuntu.com gutsy Release.gpg [191B]                    
Ign http://us.archive.ubuntu.com gutsy/main Translation-en_US                  
Get:4 http://security.ubuntu.com gutsy-security Release.gpg [191B]   
Ign http://security.ubuntu.com gutsy-security/main Translation-en_US           
Hit http://archive.canonical.com gutsy Release                                 
Get:5 http://www.virtualbox.org gutsy Release [700B]                           
Ign http://www.virtualbox.org gutsy Release                                    
Ign http://us.archive.ubuntu.com gutsy/restricted Translation-en_US            
Ign http://us.archive.ubuntu.com gutsy/universe Translation-en_US    
Ign http://us.archive.ubuntu.com gutsy/multiverse Translation-en_US  
Get:6 http://us.archive.ubuntu.com gutsy-updates Release.gpg [191B]            
Ign http://us.archive.ubuntu.com gutsy-updates/main Translation-en_US          
Ign http://us.archive.ubuntu.com gutsy-updates/restricted Translation-en_US    
Ign http://security.ubuntu.com gutsy-security/restricted Translation-en_US     
Ign http://security.ubuntu.com gutsy-security/universe Translation-en_US       
Ign http://security.ubuntu.com gutsy-security/multiverse Translation-en_US     
Get:7 http://security.ubuntu.com gutsy-security Release [51.2kB]               
Hit http://archive.canonical.com gutsy/partner Packages                        
Get:8 http://www.virtualbox.org gutsy/non-free Packages [814B]                 
Hit http://us.archive.ubuntu.com gutsy Release                            
Hit http://us.archive.ubuntu.com gutsy-updates Release                   
Hit http://us.archive.ubuntu.com gutsy/main Packages                      
Hit http://us.archive.ubuntu.com gutsy/restricted Packages
Hit http://us.archive.ubuntu.com gutsy/restricted Sources
Hit http://us.archive.ubuntu.com gutsy/main Sources  
Hit http://us.archive.ubuntu.com gutsy/multiverse Sources
Hit http://us.archive.ubuntu.com gutsy/universe Sources
Hit http://us.archive.ubuntu.com gutsy/universe Packages
Hit http://us.archive.ubuntu.com gutsy/multiverse Packages
Hit http://us.archive.ubuntu.com gutsy-updates/main Packages
Hit http://us.archive.ubuntu.com gutsy-updates/restricted Packages
Hit http://us.archive.ubuntu.com gutsy-updates/main Sources
Hit http://us.archive.ubuntu.com gutsy-updates/restricted Sources
Get:9 http://security.ubuntu.com gutsy-security/main Packages [73.5kB]
Get:10 http://security.ubuntu.com gutsy-security/restricted Packages [14B]
Get:11 http://security.ubuntu.com gutsy-security/restricted Sources [14B]
Get:12 http://security.ubuntu.com gutsy-security/main Sources [13.3kB]
Get:13 http://security.ubuntu.com gutsy-security/multiverse Sources [833B]
Get:14 http://security.ubuntu.com gutsy-security/universe Sources [6227B]
Get:15 http://security.ubuntu.com gutsy-security/universe Packages [45.6kB]
Get:16 http://security.ubuntu.com gutsy-security/multiverse Packages [2903B]
Fetched 195kB in 2s (68.8kB/s)                      
Reading package lists... Done
W: GPG error: http://www.virtualbox.org gutsy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 390EC3FF927CCC73
W: You may want to run apt-get update to correct these problems
todd@todd-desktop:~$