Re: dual boot windows 8/ Ubuntu boot problem
You already have UEFI System Partition, that's /dev/sda2. You don't need to create another one.
But it seems grub2 didn't install. Maybe that error message mentioning Locked ESP is the reason. If the UEFI System Partiiton is locked (for some kind of protection), that might have prevented grub2 to be installed.
I don't know if boot-repair can help you in this case, probably Yann will know better.
You could try to use chroot to enter into the installation from live mode and try to add grub2. Lets see what Yann says and if all else fails you can try the chroot.
Darko.
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Ubuntu 18.04 LTS 64bit
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