Several boot options

Try the following:

1) Open a terminal (Applications->Accessories->Terminal)
2) Type the following command:

gksudo gedit /boot/grub/menu.lst

3) Gedit should now open up. You want to edit the following lines:

a) make sure default is 0
b) change the timeout to something small like 3
c) uncomment (take away the # from the hiddenmenu line)

4) Save and close the file.

Sorry. Direction (3)(c) should be:

Uncomment (take away the #) from the hiddenmenu line.

In general the top of your file should look something like this:

# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 0

## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
hiddenmenu

I have tried that now

Something was different this time

When i just start the computer without doing anything i first see a MSI screen, then:

TLDR needed
Bootfailure
Insert Boot diskette in A:
Press any key when ready

Nothing has change here, but when i press f11 it boots into ubuntu, so i think i am near a solution

I'm going to go out on a limb here, and suggest that your BIOS boot sequence needs some tuning.

Sorry Jeruvy, that did not solve my problem.

I'm guessing that the problem is actually:

NTLDR needed

but that your monitor just is not configured completely correctly. That error has to do with a problem with your Windows XP partition. How exactly did you uninstall XP?

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