Your fstab shows a commented-out entry for /boot/efi. This is the EFI
System Partition, which must be mounted in order for bootloader upgrades
to work. You'll need to correct this to complete the upgrade.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1575813
Title:
Dual boot does not work after upgrade to 16.04
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