c@c-desktop:~$ sudo aptitude update && aptitude -y dist-upgrade
Get:1 http://archive.ubuntu.com feisty Release.gpg [191B]                   
Ign http://archive.ubuntu.com feisty/main Translation-en_US                 
Ign http://archive.ubuntu.com feisty/universe Translation-en_US
Get:2 http://download.tuxfamily.org feisty Release.gpg [189B]
Ign http://download.tuxfamily.org feisty/eyecandy Translation-en_US
Ign http://archive.ubuntu.com feisty/restricted Translation-en_US
Ign http://archive.ubuntu.com feisty/multiverse Translation-en_US
Hit http://archive.ubuntu.com feisty Release
Hit http://download.tuxfamily.org feisty Release
Err http://download.tuxfamily.org feisty Release
  
Hit http://archive.ubuntu.com feisty/main Packages
Get:3 http://download.tuxfamily.org feisty Release [10.5kB]
Hit http://archive.ubuntu.com feisty/universe Packages    
Hit http://archive.ubuntu.com feisty/restricted Packages  
Hit http://archive.ubuntu.com feisty/multiverse Packages  
Hit http://archive.ubuntu.com feisty/main Sources         
Hit http://archive.ubuntu.com feisty/universe Sources     
Hit http://archive.ubuntu.com feisty/restricted Sources   
Hit http://archive.ubuntu.com feisty/multiverse Sources   
Ign http://download.tuxfamily.org feisty Release          
Hit http://download.tuxfamily.org feisty/eyecandy Packages
Fetched 10.7kB in 6s (1756B/s)                                                  
Reading package lists... Done
W: GPG error: http://download.tuxfamily.org feisty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2D6CFB44DD800CD9
W: You may want to run apt-get update to correct these problems
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Initializing package states... Done
Building tag database... Done      
E: Could not open lock file /var/lib/dpkg/lock - open (13 Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?