hello, did you recently install new hardware?
try this: entered Standard CMOS Setup


set the Primary Master to:

    Type = User,  Mode = LBA

by scrolling through the options


then set the Primary Slave to:

    Type = Auto, Mode = Auto

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After installing Ubuntu I get the message, "GRUB loading...error 21"
https://bugs.launchpad.net/bugs/121485
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