Patching your system

If a newer release for a package is available, then you can upgrade it using the apt-get install --only-upgrade command followed by the package name:

apt-get install --only-upgrade package_name

For example, you can upgrade the nano package by running the command:

root@ubuntu-linux:~# apt-get install --only-upgrade nano 
Reading package lists... Done
Building dependency tree
Reading state information... Done
nano is already the newest version (2.9.3-2).
The following package was automatically installed and is no longer required: 
  hoichess
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 357 not upgraded.

You can also upgrade all the installed packages on your system by running the commands:

1. apt-get update
2. apt-get upgrade

The first command apt-get update will update the list of available packages and their versions, but it doesn’t do any installation or upgrade:

root@ubuntu-linux:~# apt-get update
Ign:1 http://dl.google.com...