Hi guys! I'm getting "Operating system not found" after installing Manjaro. First a bit of context.
On my Dell XPS 13 L321X I had a dual boot windows/manjaro. Yesterday I had the brilliant idea of
deleting the windows partition since I didn't want it anymore (also because I wanted some more space). After deleting the windows partition I got "Operating system not found" upon boot. Very well, I proceeded then by following the wiki's guide on how to restore GRUB following the UEFI guide. The problem was that i got "EFI variables are not supported on this system.". I followed the suggestions of the guide of installing efibootmgr, dosfstools and load the "efivarfs" module but once I got in chroot again I got the same error as before. So I've tried to reinstall the system from scratch.
I tried to install from the KDE edition and from manjaro-architect but every time I got the same
"Operating system not found" error after installing. Upon doing some research online, I realised that
the problem might lay on the EFI dos/gpt partition scheme of my SSD. I reinstalled a couple of times
trying a certain number of combinations of GPT + EFI partition and MSDOS classic grub install, none of wich worked.
The problem, I think, is the fact that the USB media that I used to install Manjaro (I tried also Arch Linux and KaOS, with no luck) boots not in UEFI mode but in legacy mode despite my system needs a EFI partition in order to start GRUB and consequently the OS. Here I am stuck. I don't know what I can do at this point. I also should point out the fact that this problem has arised only after the deletion of the windows partition and in the past I had various Linux distros installed (Manjaro and KaOS) and I never had too much trouble installing and booting. Could it be related to windows' fast boot mode maybe? I don't think I had it disabled.
In the BIOS of the computer there is not a single entry that could be of help, there is no mention of secure boot or UEFI/EFI either.
Anyhow, any idea of what could I do to actually boot a working system? If you have further questions please do ask, english is not my first language sorry.
Thanks to all in advance!