Update Debian Linux

I have looked at the manual and found the commands below for updating Debian Linux to the latest version:


The /etc/apt/sources.list file should be created or edited properly before the following commands work.

First, type:

aptitude update

I should see things like:

Get:1 http://ftp.kr.debian.org squeeze Release.gpg [1,672 B]           
Ign http://ftp.kr.debian.org/debian/ squeeze/contrib Translation-en            
Ign http://ftp.kr.debian.org/debian/ squeeze/contrib Translation-en_US
Ign http://ftp.kr.debian.org/debian/ squeeze/main Translation-en               
Hit http://security.debian.org squeeze/updates Release.gpg                     
Ign http://security.debian.org/ squeeze/updates/contrib Translation-en         
Ign http://security.debian.org/ squeeze/updates/contrib Translation-en_US      
Ign http://ftp.kr.debian.org/debian/ squeeze/main Translation-en_US            
Ign http://ftp.kr.debian.org/debian/ squeeze/non-free Translation-en           
Ign http://ftp.kr.debian.org/debian/ squeeze/non-free Translation-en_US        
Get:2 http://ftp.kr.debian.org squeeze Release [87.3 kB]                       
Ign http://security.debian.org/ squeeze/updates/main Translation-en            
Ign http://security.debian.org/ squeeze/updates/main Translation-en_US         
Ign http://security.debian.org/ squeeze/updates/non-free Translation-en        
Ign http://security.debian.org/ squeeze/updates/non-free Translation-en_US     
Hit http://security.debian.org squeeze/updates Release                         
Hit http://security.debian.org squeeze/updates/main Sources                    
Get:3 http://ftp.kr.debian.org squeeze/main i386 Packages [6,567 kB]           
Hit http://security.debian.org squeeze/updates/contrib Sources                 
Hit http://security.debian.org squeeze/updates/non-free Sources                
Hit http://security.debian.org squeeze/updates/main i386 Packages              
Hit http://security.debian.org squeeze/updates/contrib i386 Packages           
Hit http://security.debian.org squeeze/updates/non-free i386 Packages          
Get:4 http://ftp.kr.debian.org squeeze/contrib i386 Packages [54.1 kB]         
Get:5 http://ftp.kr.debian.org squeeze/non-free i386 Packages [108 kB]         
Fetched 6,818 kB in 54s (125 kB/s)                                             
                           
Current status: 27364 new [+27027].

Second, type the command for security upgrades:

aptitude safe-upgrade

I should be able to see things like:

No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

Third, type:

aptitude dist-upgrade

Then, I should see the response like:

No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

The information comes from this page.