Optimize SSD for Ubuntu 14.04

https://sites.google.com/site/easylinuxtipsproject/ssd

http://www.howtogeek.com/176978/ubuntu-doesnt-trim-ssds-by-default-why-not-and-how-to-enable-it-yourself/

http://ubuntu.aspcode.net/view/635400140124705175597538/black-screen-while-installing-ubuntu-12043-on-dell-precision-m4800

(for SSDs) Restart installation, select manual partitioning, edit partition, set use as ext4 , mount point: / , additional flags: discard, noatime these flags are useful for SSDs, discard uses block erase capabilities of SSDs, and noatime prevents the system for recording last access time in every files.