Which method do you want me to try first?
os-prober
in recovery mode with root?
or
Boot Repair
How do I do this? Any guide?
I am rushing out the door, back in about an hour or so...
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I have never tried os-prober, but can say Boot Repair has got me out of trouble once.
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It is undoubtedly the boot partition.
Being FAT32 file system, that is the only Linux partition Windows can access. See the partition mapping of my Zorin installation below:
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Yeah. I have a bad habit of doing stupid stuffs. But this is how I learn.
Lesson here: DO NOT TOUCH the 500 MB FAT32 that shows up randomly in Windows 10.
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For sure. I just saved my butt. I'm back in Zorin OS.
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How did you end up fixing it. Boot Repair or what?
In general, it is better not to meddle with the files in other OS unless you setup a shared data partition.
Boot Repair through Zorin OS Live boot on the flash drive. I saw it reinstall grub and linux-header-generic.
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Thanks for confiring that. That info may help someone else one day. Good to hear you are back zorining again 
After I fixed it with boot-repair with live boot, I boot into ZorinOS safely. I checked with
sapphire@sapphire-X570-UD:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 223.6G 0 disk
├─sda1 8:1 0 1K 0 part
└─sda5 8:5 0 223.1G 0 part /
It looks wrong. Where is the EFI partition now?
Extra photos
Can you post a Gparted screenshot.
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Your FAT32 EFI partition is on the first disk you show, not the second. But is only 100Mb.
You are dual-booting Windows, Yes?
Absolutely NOT. I know dual-boot is horrible when Windows 10 is on the same drive. That's why I put ZorinOS on its own SSD. It used to looks like @FrenchPress
's picture.
I remember when I tried to save as much space possible on a 7GB eMMC, I found that the boot partition could be as small as 100GB.
What do I do with the 539 MB on /dev/sda now? Should I move it back to /dev/sda instead of the /dev/nvme0n1
I do not think it is possible.
Moving a partition can be done only on the same disk.
The only thing I can think of is that you could expand pre-existing ext4 partition to take up this empty space. But for 240GB disk, you may not notice any difference.
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Due to the fact that /boot/efi on the same drive as Windows 10, this worries me when Windows 10 updates. That's why I want to move it. Too many threads related to the Windows 10 updates messed up the dual-boot situation in Linux.
I thought boot-repair would put the grub-efi on /dev/sda. Oh well.
The only dual-boot I have is on a 10 years old Acer Aspire.
It is a dual boot with Windows 11 (not a typo) and Zorin 16.
Since the system has a legacy BIOS only, it may not be the same. But I've never had a single issue with Windows update on this machine.
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