I'm new here so I apologize in advance if my question is not formally correct.
I have a dual boot system, on two different disks. Windows was pre-installed on the first drive (500 Gb), then I installed ubuntu 20.04 on the second 1 Tb drive following the answer in this discussion Dual Booting win 10 and Ubuntu 18.04 on two separate physical ssds (I find it very very useful and clear). Both disks are SSD. The system is full uefi. Since I wanted to completely isolate the two different operating systems I configured the second drive like this:
- 650 Mb Efi partition (sdb1)
- 20 Gb Ext4 @ / (sdb2)
- 10 Gb Swap (sdb3)
- remaining free space @ /home (sdb4)
During the ubuntu installation process I did not unplug the first drive (where Windows is) and I incredibly skipped (that's my fault, I know) the “workaround” steps to avoid the installation of ubuntu bootloader on the first drive (this situation is known as a bug as I read in the discussion linked before). So, even if I chose the “sdb1” partition (just created) in the “Device for boot loader installation” menu, probably that bug occurred or simply my choice was ignored. Now I have two questions, which represent for me two alternative ways to restore the situation:
1 – Can I move the ubuntu bootloader from the first drive, to Efi partition in the second drive? If yes, how can I do this? In this way I hope to isolate the two OS.
If not, the second question is:
2 – Since the ubuntu bootloader is now installed on the Efi partition of the first drive, can I delete the Efi partition of the second drive that I created during installation process? In fact I see that this partition is empty and unmounted, so basically unutilized.