/dev/sdb1 was the name of the root partition when you installed it first, but it got another name when you tried to boot from another laptop. This is normal. The usual solution would be to specify partitions by label or uuid, because that will hardly change.
But I think first you need to read this: https://www.linuxquestions.org/quest...ad-4175614092/

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@pan64, thanks for your answer, I know that kali is not for beginners, and I really understand your point, but when I first installed kali I didn't know and now than I already have it installed I still would like to use it since it is basically Debian, and has a lot of support and software. I Also know my way around the system.

lets see here,
1.install Linux on external HDD, install grub onto that same hdd mbr, ueif .. either way modify if necessary the fstab to use UUID for hdd update-grub, no matter what other OS's grub picks up because this is what grub does, looks for all OS'es attached and adds them to the listing, the Linux installed on the hdd too will be added to the first on the list.
2. when booting same said hdd, use the BIOS of the SYStem booting to select that hdd and its grub boot manager will be used to boot same said Linux installed on that hdd, all other OSes it has in its listing are arbitrary due to the means it is being used.

2 members found this post helpful.

Thank you very much i think from here I will be able to solve the problem by myself.
However I have one last question.
In case somehow changing the fstab to UUID doesn't work. Will my problem be fixed if I reinstall windows in legacy mode and then reinstall Kali to the HDD and add the grub boot loader to my system? Also if I decide to choose another distro, will it even require me to reinstall windows in legacy or does only kali have this problem?

this problem is not related to kali, but the process how the devices detected. And /dev/sdXX is more or less unreliable - as I mentioned before.

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When I type /etc/fstab inside of kali it says that I don't have authorization even though I'm root

Update: I just had to type update-grub and now my problem is fixed thank you all, I am so happy that this community is so active and helpful☺️.

That's expected behavior. fstab is a text file so you need to put the text editor name before the command so that if you are root/sudo and you are using gedit as a text editor you would type: sudo gedit /etc/fstab.