[ale] Ubuntu kernel won't boot

[Jim Philips]

I'm running Hardy Heron and it installed kernel 2.6.24-17. All of the pieces 
for that kernel seem to be there. Indeed, vmlinuz points to that kernel:

lrwxrwxrwx   1 root root    30 2008-05-26 08:06 vmlinuz.old -> 
boot/vmlinuz-2.6.24-17-generic
lrwxrwxrwx   1 root root    33 2008-05-26 08:06 initrd.img.old -> 
boot/initrd.img-2.6.24-17-generic
lrwxrwxrwx   1 root root    26 2008-05-27 20:57 vmlinuz -> 
boot/vmlinuz-2.6.24-17-386
lrwxrwxrwx   1 root root    29 2008-05-27 20:57 initrd.img -> 
boot/initrd.img-2.6.24-17-386

All of the corresponding entries seem to be there in the boot directory:

-rw-r--r-- 1 root root  419412 2008-05-01 13:55 abi-2.6.24-17-386
-rw-r--r-- 1 root root  422667 2008-05-01 13:59 abi-2.6.24-17-generic
-rw-r--r-- 1 root root   80050 2008-05-01 13:55 config-2.6.24-17-386
-rw-r--r-- 1 root root   80071 2008-05-01 13:59 config-2.6.24-17-generic
-rw-r--r-- 1 root root 7856274 2008-05-30 18:04 initrd.img-2.6.24-17-386
-rw-r--r-- 1 root root 7856460 2008-05-27 20:57 initrd.img-2.6.24-17-386.bak
-rw-r--r-- 1 root root 7882003 2008-05-26 08:06 initrd.img-2.6.24-17-generic
-rw-r--r-- 1 root root 7881991 2008-05-26 08:06 
initrd.img-2.6.24-17-generic.bak
-rw-r--r-- 1 root root  883082 2008-05-01 13:55 System.map-2.6.24-17-386
-rw-r--r-- 1 root root  905012 2008-05-01 13:59 System.map-2.6.24-17-generic
-rw-r--r-- 1 root root 1846360 2008-05-01 13:55 vmlinuz-2.6.24-17-386
-rw-r--r-- 1 root root 1921944 2008-05-01 13:59 vmlinuz-2.6.24-17-generic

But if I select either the 386 or the generic version in Grub at boot time, I 
get:

Error 15: file not found

I don't understand what I'm missing. The only kernel I'm able to boot is 
2.6.24-15. 
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