U buntu reached the 10 second boot time with Lucid Lynx. what if your system isn’t quite reaching that point? You can speed it up using profiling option. To do this follow these steps: At your boot screen press “e” (for edit). Use your arrow key and move down to the entry beginning with “kernel”. Press “e” again. Add “profile” (no quotes) at the end of this line. Hit Enter. Click “b” (for boot). The firs time you boot with profile it will take a little longer. What this is doing is profiling your boot process so it knows what files are accessed and then sorts them according to how they are stored on your drive. Your next boot should be considerably faster. Extra Tip:- By disabling Floppy disk in Bios will improve your boot time considerably. src: http://www.aroundtheweb.info/2010/04/how-tospeed-up-ubuntu-1004-lucid-lynx.html
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