@Phillip: fscking the ESP (and all other partitions) returns no warning nor error:
# fsck -fyM /dev/sda2 fsck from util-linux 2.20.1 WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. and the Input/Output error remains after the fsck. (Full log: http://paste.ubuntu.com/1469303/ ) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1090829 Title: grub-efi cannot install on locked ESP (Input/output error) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1090829/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs