How to boot ubuntu from my sd card

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http://askubuntu.com – I want to try ubuntu, so I put it on my sd card 32 card. But I can't figure out how to boot from my sd card from my boot menu. My sdcard usb drive is too outdated i got in 2005 and it only Support sc not sdhc my sd card is a class 6 32 gb sdhc. and my computer is a dell inspiron n7110. Please help me. (HowTos)