Burn a live Linux system onto a USB (can be one with just a terminal, like Arch Linux). If you don’t have another computer to plug the USB into, this can be done on an Android phone using EtchDroid.
Then, boot from that USB and mount your main filesystem. Inside of the Live system, chroot into the mounted filesystem and run sudo grub-mkconfig -o /boot/grub/grub.cfg which should fix the bootloader.
After that, you can just exit the USB system and return back to your OS which should boot now.
(If you don’t know how to mount a filesystem or chroot, I would explain but I forgot how to do it. If someone else could explain that would be neat)
Welcome, this is the Linux user equivalent of popping your cherry.
You have a few options, but the easiest is to just use a rescue thing like Rescatux on a USB drive that automates most of the process. If you haven’t the means of flashing a USB drive (like another computer) but still have your linux installation USB drive, most distros offer a “rescue existing install” option somewhere in their installer/liveUSB. But you’ll have to search around.
Dont forget to play around with grub while its like this. Tab completion works great, try ‘(’ the press tab to maybe see your disks as grub sees them. I think help lists commands and most of them are harmless.
The process for this is that you want to set your prefix to the /boot partition in the (hd1, gpt1) syntax (use ls) and then load the “normal” module. From then on, you should have regular GRUB again and should be able to boot your OS to properly fix GRUB.
Sounds like you’d love configuring network hardware then! You can get a peek into that in Linux with frr since it has a mode to configure your linux machine like you’ve just SSHed into a Catalyst switch, or just hop on ebay and buy a 20 year old switch for peanuts
I also like www.system-rescue.org, it also has a menu entry that will detect and boot into installed Linux systems.
Remember that you can use Ventoy as a super simple method of using these tools. Ventoy will prepare a flash drive with a tool that, when booted, will give you a menu of all the ISO images on the drive and lets you boot any of them. You can have a drive with a collection of rescue tools, install ISO’s, whatever you want, and it’s as easy as dropping the ISO’s on there. You can also use that partition to store your own files or whatever you want, it doesn’t mind.
Can you give a little more background info? What distro are you using, are you dual booting, is it a new install, did you make changes to your kernel, your partitions or grub before that?
While it’s clear that grub couldn’t find a kernel to boot, we need these Infos to help you find a solution.
You may want to replace the disk on that computer after you fix your boot. (As people said, with a recovery drive, probably the same one you use to install.)
After your computer is back, get a SMART client (like smartmontools) and check your disk status.
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