grub: module ext4dev not found after moving partitions

Question

os: debian testing 64bit

hd:

/dev/sda1 20 gig
/dev/sda2 100 mb /boot
/dev/sda3 extended
/dev/sda5 /

I deleted sda1 and sda2, created a new sda1 with 100mb and sda2 with 20 gig. copied the contents of / (sda5) to sda2.

booted into debian live rescue, chrooted sda2 and mounted sda1 to /boot. i edited my /etc/fstab to match the uuids of / and /boot with sda2 and sda1. then i did

grub-mkdevicemap
grub-install /dev/sda
update-grub

when i reboot now, i get a grub with a menu for my kernels and memtest, etc.

however if i select my default entry grub tries to boot and says

module ext4 not found

can't find file or director /dev/by-uuid/$UUID

and several other modules not found

EDIT1: unfortunatley sda5 seems not to be ext3 as expected

EDIT2: grub entry

os {
    insmod gzio
    insmod part_msdos
    insmod ext2
    set root='(hd0,msdos1)'
    search --no-floppy --fs-uuid --set=root $UUID_OF_SDA1
    echo    '…'
    linux   /vmlinuz-3.2.0-2-amd64 root=UUID=$UUID_OF_SDA2 ro  quiet
    echo    '...'
    initrd  /initrd.img-3.2.0-2-amd64
}

Answer 1

1. Was your / on /dev/sda5 also an ext4 partition?

2. What is your default grub entry?

I see tow possibilities: a) your default grub entry is a chainload command to /dev/sda2 and you don't have grub installed on /dev/sda2. b) This error message is not generated by Grub but by your kernel and it doesn't have ext4 support and you have to rebuild your ramdisk to include an ext4 driver.