[ubuntu] accidently edited bootloader text wuloader

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http://ubuntuforums.org – hey when it is booting i accidently pressed e and edited the text and now i get two errors one says "can not find wuloader and another can not speciy prefix or something.. i cant load up ubuntu anymore it just goes to a blank purple screen anyone know how I can fix this so that I can start booting Ubuntu normally again? thank you (Hardware)