You might of come across this page because your BIOS or efibootmgr has also corrupted, meaning that you can no longer boot from USB and otherwise change systems. One of these problems can be your BIOS registering bootloaders on EFI System Partitions (ESP), or otherwise being suck in 32-bit Legacy when you want it in 64-bit UEFI bootloading.
For me, I was luck enough to have both problems, so if you have either then you’ve come to right place! Fortunately, I was eventually able to re-install 64-bit Linux onto a new internal HDD with the compromise of 32-bit booting in Legacy, due to a faulty BIOS. Continue reading “Installation workarounds for a corrupt BIOS: GRUB Rescue and removing the hard drive solution”