*** This bug is a duplicate of bug 1767703 ***
https://bugs.launchpad.net/bugs/1767703
Error:
grub-installer: Installing for x86_64-efi platform.
kernel: [ 986.571266] FAT-fs (sda2): error, corrupted directory (invalid
entries)
grub-installer: grub-install: error: cannot open
`/boot/efi/EFI/ubuntu/shimx64.efi': Input/output error.
kernel: [ 995.537581] FAT-fs (sda2): error, corrupted directory (invalid
entries)
grub-installer: error: Running 'grub-install --force "/dev/sda"' failed.
** This bug has been marked a duplicate of bug 1767703
Calling 'apt-install grub-efi-amd64-signed' failed
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https://bugs.launchpad.net/bugs/1770075
Title:
fatal error, unable to install ubuntu 16.04,grub installer problem
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