I installed it from the Calamaries Installer found in the LIVE USB ISO this time. And Instead of my primary hdd, I installed it on the other one. Works now, thanks for all of your support, dear nerds.
It’s a PC. Two Hard Disk Drives
1st Drive: SATA:PM-KINGSTON S
2nd Drive: SATA:SM-ST500LT012
edit: 1st one is of around 138GB, 2nd one has around 500GB
Ok, that looks like a fairly standard setup. I guess taking a look at the boot loader itself would be the next step. When you see the Debian bootloader you could try pressing ‘e’ to view what commands it uses internally to boot. The lines starting with “linux” and “initrd” would be most interesting.
So it still uses a MSDOS partition table, interesting. This usually only happens on systems that do not support EFI at all.
Is your BIOS and main board fairly old per chance?
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