Mount the root (my Ubuntu) to /mnt and some other things (/dev /proc /sys) and then sudo chroot /mnt then grub-install /dev/sda then reboot and what you see now
Mount them seperately yes Also mount -a after chroot I assume you're csm grub-install --debug --force /dev/sda
How to know? I don't remember
Should I do again?
Depends on your motherboard, drive's partition table, it's faster case also makes it possible for drives above 2TB to work
Don't forget grub-mkconfig
My disk size is 1TB
Is there any command to say which one I am?
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