I installed Manjaro last night but forgot to make my laptop unbootable without a particular USB key plugged in. In kubuntu, I did this simply by having /boot/efi on the key.
I really don’t want to re-install if I don’t need to so I’m wondering if it’s as simple as booting to the live environment, setting up the USB key, and updating fstab, then after a successful reboot, removing the original partition. Maybe updating grub also?
Are there any gotchas here?
Thanks.
Hi and welcome to the forum 
You might take a look at:
It also has some info regarding files needed by the Grub-bootloader which might be needed depending on your setup 
Thanks for the welcome.
That didn’t go too well but I have working laptop again, sort of, and it’s a weird one.
What I did - and undid
Having put the fstab back, if I boot the laptop to the graphical target I get a black screen and it locks. I can’t switch to a tty or do anything except press the power button.
If I boot to a non-graphical target by adding 3 to the Linux line in the grub menu and manually run startx, everything is fine.
Now for the weird bit. If I boot to run level 5 with the Live USB plugged in to a particular port, everything works. This is the one that’s throwing me, I don’t even know what to search for!
There is no reference to the usb key in fstab, crypttab, and it’s definitely not mounted anywhere. Looking at the journal for a failed boot just shows that it stops until I press the power button.
Have you heard of anything like that?
It may have been having this issue before I fiddled but some boots working, I may have been lucky and not noticed. Oh, and the Live USB still works as a live USB!
That is a different issue as topic title, you can start a new thread for that
I got round it by blacklisting the AMD. Now back to my original quest 