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While booting, I am getting the error message internal error: the second sector of Stage 2 is unknown." This is under Ubuntu 10.04 Lucid Lynx. After posting, the full text of the GRUB loading screen is:

GRUB Loading stage1.5

GRUB loading, please wait....
internal error: the second sector of Stage 2 is unknown.

This is an existing install that has been working for a long time. I came home to find the computer powered but not responding with no input to the monitor. Upon rebooting, this error message was displayed.

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up vote 3 down vote accepted

I would try reinstalling GRUB2 from the Live CD; if this errors out, this should give you at least some hints about what is going wrong with the system. (The fact that you found the computer non-functional after leaving it powered on for some time suggests some hardware problem happened.)

There are step by step tutorials on the Ubuntu wiki and on FOSSwire (more command-line oriented).

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LiveCD + fsck fixed it. Thanks for your help. – Alex Grin Oct 6 '10 at 16:06

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