Dual boot Windows 10 and Ubuntu

In the past week, i was busy setting up Windows 10 and Ubuntu on few HDD and SSD. I encountered some miscellaneous challenges along the way.

Zombie EFI boot entry in BIOS

When i am in BIOS screen, i change the boot priority to USB drive. I expect BIOS to boot from USB drive. Instead, it would boot from hard drive every time. I go to Ubuntu Linux, issue the command “sudo efibootmgr -v”. I notice there is a boot entry which looks like USB but it would load from hard drive.

The suspicious boot entry is the one circled in red in the figure above. Using the command “sudo efibootmgr -b <number> -B” to delete it. Reboot. And the boot entry comes back again. In the end, i found a way to delete the boot entry in Windows.

I start a command prompt with administrator right, then run diskpart.

I list the disk and select the disk, and show the disk details to make sure it is the correct disk.

Then, i select the system partition and assign a drive letter to it.

After that, i exit from diskpart. Using the command prompt, i select the X drive and show the BOOT folder in EFI folder.

After i delete the folder, the boot entry is removed permanently.

Clone a Windows disk

Using AOMEI diskupper, i clone a Windows HDD. When booting up, the new HDD refused to boot up. To make it boot, i use AOMEI partition assistant to rebuild the MBR on the new HDD.

Clone a Linux disk

Using Clonezilla, i cloned Ubuntu from HDD to SSD. The clone was successful. Then when booting, there was an error.

ALERT! UUID=dd84f4b3-d5bf-42e4–9b5e-ec685a461fad does not exist. Dropping to a shell.

I checked the /etc/fstab entry in Ubuntu. There is an entry with the same UUID as above. I could not solve this error.