*** This bug is a duplicate of bug 1090829 ***
https://bugs.launchpad.net/bugs/1090829
I found several similar cases: Bug #1090829
I strongly suspect Microsoft / the PC maker to lock writing on the ESP.
Creating another EFI partition allows to workaround the issue.
** This bug has been marked a duplicate of bug 1090829
grub-efi cannot install on locked ESP (Input/output error)
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https://bugs.launchpad.net/bugs/1046572
Title:
grub-efi fails (cannot create directory `/boot/efi/EFI/ubuntu')
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