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My Ubuntu 14.10 x64 installation exits at grub -install /dev/sda, it says error: cannot open '/boot/efi/EFI/ubuntu/shimx64.efi:Read-only file system. My computer is Lenovo-Y430p, preinstalled Windows 8.1, I have turn off the Secure Boot and Fast Boot, using UEFI boot mode in BIOS.

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I do not know if your computer has a locked ESP that prevents writing outside the /EFI/Boot and /EFI/Microsoft folders. A bug has already been reported in such cases (which leads to 'read-only' errors like the one you are getting).

It would be a good idea to try the workarounds given in the bug report page.

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