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i had windows 7 installed on my netbook. Then i installed ubuntu netbook edition
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Is Ubuntu install to hdd?
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later on i wanted to try this android os for desktop. so i make a bootable pendrive the android os and try booting it from the pendrive.
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You may have written boot record to pendrive to test try booting with & without pendrive.
If boot record is on pendrive it may have done "os-prober" & "update-grub"
Also if it's done this and your new os is available boot into it and reinstall grub and you should be able to boot both os'es.