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The easiset way to perform modifications in the boot sequence is to use a bootable UEFI USB device.
If you need to create a device from zero, please follow the guide https://secospasecogroup.atlassian.net/l/c/Qowq6eo8Kvry6Eos
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What about Linux?
The first step is creating a script that will be called during the EFI Shell boot from the hard disk.
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| Code Block |
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mv grubx64.efi grubx64_org.efi |
Non Now poweroff the system. On the next boot the EFI Shell will be launched before loading Ubuntu OS and the requested operations will be performed.
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