[ubuntu] Ubuntu LTS 12.04 takes 15-20 minutes to boot!!!

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http://ubuntuforums.org – Please help. My Ubuntu Precise Pangolin installation was booting up pretty fast, it takes about 10-15 seconds to boot until today. When I turn on my PC this morning it was taking a very long time to boot maybe about 5 minutes that I decided to press the reset button then encountered unknown file system and grub rescue error. But I was able to fix this by booting on the LiveUSB, check and fix the filesystem via gparted. I decided to purge grub2 and reinstall it, update grub and restart, because I was thinking that the boot time has something to do with grub. But the next time I boot, it too (Hardware)