[ubuntu] "Writing GRUB to Boot Device Failed" When updating to GRUB 1.99-21

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http://ubuntuforums.org – I just got back to my house and found that there was an update for GRUB (to 1.99-21). Since it's a GRUB update I thought "why not" and went ahead and installed it. As it was nearing the end of the installation, it brought up Debconf where it asked me which devices I wanted to install GRUB on (see Image 1). I selected The drive and partition Ubuntu is on, but when I hit next, I got what the title says (Image 2). I don't want to simply continue, because of the warning it gives. At this point, I have absolutely no idea what to do. Any amount of help would be appreciated. Image 1. P (Hardware)