EFI partition in dual-boot system

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22

Success!

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I took a bit of a meandering path to get here, but I think conceptually this set of steps would work without the meandering. I offer no guarantees of course, but thought I’d share what I ended up doing (while filtering out the failed steps and associated restores.

  • Backup via clone/rescuezilla!!!
  • In Live Ubuntu/gparted
    • Resize “rightmost” partition to make room for bigger ESP
    • For each other partition, move to the right to fill the available space
  • Probably good to validate everything is still OK at this point for Ubuntu and Windows boots
  • Copy the contents of the EFI partition to a backup location
  • In Live Ubuntu/gparted
    • Capture the UUID/Serial Number of the current EFI partition
    • Delete the current EFI partition
    • Create new FAT32 partition
      • I had to drop to terminal and reformat in order to get the UUID/serial number set properly: mkdosfs -F 32 -i <saved UUID> /dev/xxxxx
    • Copy previously saved contents to the newly created EFI partition
    • Set the flags to “boot”, “esp” & “no_automount”
  • Cross fingers and test booting both Windows and Ubuntu
1 Like
23

Well done - mission accomplished

Is your next challenge each OS on a separate disk? :wink: