Ubuntu 9.10 doesn't "shut down" properly.

I'm dual booting Ubuntu and Windows XP SP3 Pro. (Windows XP is up to date.)

My hardware is a Compaq Presario, AMD Athlon XP3200+, 2.2 GHz, !GB RAM.

Prior to my upgrade to Ubuntu 9.10, the final stage of a Ubuntu "shut down" was my hardware being powered down.

When Ubuntu 9.10 is "shut down," the desktop goes away and the following is shown on my display:

usplash: Setting mode 1152x864 failed-14-generic'
usplash: Using mode 1024x768
 Filesysten type is ntfs, partition type 0x07
Ubuntu 9.10 ubuntu tty1ectory (i.e., relative path is /ubuntu/disks)
   [Linux-bzImage, setup=0x3400, size=0x3b26e0]
ubuntu login: [10020.210589] Buffer I/O error on device loop0 logical block 3113471
[10020.211100] Buffer I/O error on device loop0, logical block 3113475
[10020.211562] Buffer I/O error on device loop0, logical block 3113476
[10020.211991] Buffer I/O error on device loop0, logical block 3113477
[10020.225314] EXT-fs error (device loop0): ext3_get_inode_loc: unable to read inode block - inode=774904, block=3113038
[10020.225483] Aborting journal on device loop0.
[10020.225572] Buffer I/O error on device loop0, logical block 1671679
[10020.225635] Remounting file system read-only.
[10020.225720] Buffer I/O error on device loop0, logical block 0
[10050.276105] Buffer I/O error on device loop0, logical block 2413981
[10050.276184] Buffer I/O error on device loop0, logical block 2263090