31.08.2019

Ubuntu Linux: Change from Legacy boot to UEFI boot after installation

This weekend i did an installation of Linux on a laptop where already a windows 10 was installed.
Because laptop did not recognize my linux boot usb-stick i changed from UEFI to legacy mode and the installation went through without any problem.

At the end grub was in place but the windows installation was not listed. This is, because windows does not support booting.

The problem: If i switch back to UEFI the linux installation did not start anymore.

My solution:
  • Change to UEFI and boot with a live linux
  • Install boot-repair into the live linux
    (https://help.ubuntu.com/community/Boot-Repair)
    sudo add-apt-repository ppa:yannubuntu/boot-repair
    sudo apt-get update
    sudo apt-get install -y boot-repair
  • Then run boot repair
    boot-repair
  • Follow the instructions on the Boot-Repair homepage (s. above)
  • Enter the commands of the following popus:


And after removing the live CD i got an boot grub menu, where windows was in place and working (and the Ubuntu Linux worked, too ;-)

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