I am trying to upgrade to 18.04 using sudo do-release-upgrade -d, but it exits the installation with the message:

Calculating the changes

EFI System Partition (ESP) not usable 

Your EFI System Partition (ESP) is not mounted at /boot/efi. 
Please ensure that it is properly configured and try again. 

Restoring original system state


I have Windows on this machine as dual boot. Fast boot is disabled on Windows 10.

I have tried to mount it in GParted but the option is disabled...

/dev/sda1 info which is ESP

What should I do to be able to move forward?

  • You could start by verifying that you have a /boot/efi filesystem mounted.
    – Soren A
    Feb 23, 2018 at 8:31
  • it is not mounted 'I have tried to mount it in GParted but the option is disabled...' Feb 23, 2018 at 8:32

1 Answer 1


You have to mount your ESP. This should work with:

sudo mount /boot/efi 

If you get an error message like

mount: can't find /boot/efi in /etc/fstab

you have to add a line to your /etc/fstab e.g.

UUID=XXXX-XXXX  /boot/efi       vfat    umask=0077      0       1

replace the XXXX-XXXX with the UID of your ESP (e.g. from the output of blkid /dev/sdxX or from gparted (92E8-1BEE in your case))

  • Editing this helped me also so fix unbootable Ubuntu after accidentally deleting the Windows partition with the previous boot partition May 18 at 16:50

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