installed ubuntu 20.04 on thinkpad X1 8th but does not boot.

Hi 

This seems quite a bit of an ordeal to install Ubuntu together with
windows 10 (in the past I have always deleted Windows 10)
I managed finally to shrink the partition run the installer chose ext4
and the swap partion after finishing the installation I reboot, but the
boot manager does offer Ubuntu but directly passed to windows. I am
puzzled. 

Any idea please

Regards

Uwe Brauer 

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