I'm trying to install Ubuntu 18.04 (dual boot / alongside Windows) on my Lenovo Yoga 520 with the InsydeH20 BIOS Setup Utility, but I have the following problems:
I cannot disable fast boot. I know that disabling the option is needed for a correct installation, but disabling it in the boot menu has no effect. Turning off the computer and checking the boot menu again yields seeing the "Fast boot" option as active (the BIOS battery should not be dead as other options survive)
The installer sees no partitions. When trying to install the OS, the installer doesn't show me any partitions to select.
I managed to fix one problem though: I used to get the error "MODSIGN: Couldn't get UEFI db list" but managed to "fix" it by resetting some keys in the boot menu (now I only get the error "Couldn't get size: 0x000...").
I have already disabled fast startup in Windows but it doesn't seem to have any effect as can be seen here... My only idea for the cause would a broken hybernation file.
EDIT: I have the Intel RST Option in my bios Setup activated. Do I Need to switch to AHCI?
I accept any advice, thank you in advance.