I must say I have messed up my Grub twice on Manjaro Linux and have learnt to just take a deep breath, go grab some coffee, and get on with figuring out the repair. I've never lost any data and both times it was my own stupidity, and usually related to writing a Grub change to /dev/sda where actually my boot drive is /dev/sdb and that is where my Grub is supposed to write to.
So if you still panic (or have never had a Grub issue and don't know what panic is) then this is a good guide to read through and keep for that future event.
See
Ubuntu: Grub repair [Guide]#
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grub
Do you have a Ubuntu Linux PC that you can't boot because of the Grub bootloader's problems? We can help! Follow along with this guide as we go over how
