Alekander,
Welcome to JustLinux.
JustLinux has a lot of experienced Linux experts who can talk "-" and "." in the commands but there are newbies at the bottom of the food chain like myself who try to make thing simple whenever possible. Having said that some explosure into the Linux terminal commands will guarantee huge reward. And if I may say so the terminal commands of Linux is perhaps representing at least 50% of the wealth of that OS hidden from the desktop. I survive on only one text book "Linux in a nutshell".
This thread has a hidden message of that the two most lethal booting weapons are
(1) Grub bootable floppy (or CD or pen drive)
(2) A Linux Live CD.
You can boot any PC system by the former. The latter is the universal tool to "restore" any Linux boot loader.
You should isolate your problem and concentrate to solve them one at a time. The mouse problem can be overcome if you plug in a PS2 mouse as some distros can mismatch a mouse driver easily especially if you are using a fancy one.
According to Grub Manual, which I always consult by just Google, the error 21 is
This prompts me to believe the problem lies with Ubuntu or you may have altered the disk order in the bios causing Ubuntu to boot to the wrong disk other than the one it was originally installed.Code:21 : Selected disk does not exist
To resolve the problem you need to do the following
(a) Stop messing around the boot disk order, freeze it now or a setting that it works for at least one system.
(b) post the output of the following after booting up Ubuntu CD, which can be used as a Live CD
(1) the terminal command of "sudo fdisk -l"
(2) /boot/grub/menu.lst (tells us how Grub boots Ubuntu)
(3) /boot/grub/device.map (tells us the boot disk order at time of installation)
(4) /etc/fstab (tells us the partitions the kernel has been instructed to mount)
The Item (1) tells us every partition of everyt disk in your PC
The Items (2), (3) and (4) are to be obtained from installed Ubuntu partition which you need to mount it first from the boot-up CD. If you do not know how just supply the Item (1) and we shall advise.
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