[Bug 1091477] Re: grub-efi cannot install on locked ESP (read-only error)

[Phillip Susi]

More anecdotes or "me too"s aren't helpful.  What we need is for someone
to fsck the fs to a known good state and then try again.  If you can do
that, and then installing causes the error to come back, that would
point to a bug in the kernel that someone could try to reproduce and
track down, possibly with the help of an image of the fs in the before
state.

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https://bugs.launchpad.net/bugs/1091477

Title:
  grub-efi cannot install on locked ESP (read-only error)

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  Some Windows8 computers come with a locked ESP that prevents writing
  outside the /EFI/Boot and /EFI/Microsoft folders, thus preventing the
  creation of a /EFI/ubuntu folder.

  This leads to a "Read-only" error when trying to install grub-efi.

  Example:
  http://ubuntuforums.org/showthread.php?p=12409846#post12409846

  Remark: this is similar but not duplicate of Bug #1090829

  **************** WORKAROUND:
  1) via Gparted create another EFI partition (FAT32, 200MB, located in the first 100GB of the disk)
  2) move the 'boot' flag on it
  3) make Ubuntu use this new ESP (eg via Boot-Repair --> Recommended Repair).

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