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Figure 1.9: Memory test in progress 
While doing a memory test can add considerable time to the installation process, I 
definitely recommend
 it on physical servers, especially if the hardware is new and 
hasn't been tested. In fact, I make it a practice to test the RAM of all my servers once 
or twice a year, so any installation media you create can be used as a memory tester 
any time you need one.
Boot from first hard disk
, pictured in 
Figure 1.8
, allows you to boot from the first 
hard disk, which is typically an existing operating system. If you left the installation 
media in the PC after the installation was finished, you can choose this option to 
attempt to boot the existing OS.
From this point forward, we will progress through the various screens to customize 
our installation. I'll guide you along the way.
The memory test can take a very long time to complete (multiple 
hours) depending on how much RAM your server has. As a 
general rule of thumb, I've found that if there are issues with your 
server's memory, it will typically find the problem in fewer than 15 
minutes. Press 
Esc
 to abort the test.

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Deploying Ubuntu Server