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Remove Shutdown and Reboot Option from Linux GUI Login Screen ( GDM Setup )

Q. I've a central Linux test server. It has GDM based GUI login screen. How do I remove both shutdown and reboot server options from the login screen?
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Ubuntu Linux: Upgrade Linux Kernel

Q. How do I upgrade my Linux kernel version under Ubuntu Linux 7.04 / 7.10?

A. You can use any one of the following method:
(a) Command Line Tools - apt-get

(b) GUI tool

apt-get command - Upgrade Linux Kernel

Open terminal and type the following commands:
$ sudo apt-get update
Now search kernel version:
$ apt-cache search kernel-image
Now install kernel by explicitly specifying version number:
$ sudo apt-get install linux-image-2.6.xx-yy-generic
Replace xx.yy with kernel version number. Reboot the system.

GUI tools

This is recommended method for most user. Click on System > Administration > Update Manager > Click on Check button > Apply all updates including kernel.

Disable ctrl+alt+del on Centos Linux server

How do I disable CTRL + ALT + DEL reboot keys shortcut on Linux server?
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