Installer incorrectly detects non-UEFI boot when using Ventoy (UEFI confirmed)

[Satbir6]

System details

Device: Lenovo (PN: 82Y9009KIN) Serial Number: MP2KDFWL BIOS Version: M3CN46WW Firmware Settings: Secure Boot: Disabled Boot Mode: UEFI CSM: Disabled (or not exposed) ISO: omarchy-3.5.1-2 Boot Method: Ventoy (latest) USB Boot Entry Used: UEFI: SanDisk / Ventoy

What's wrong?

The installer shows:

"Not booted with EFI or running in a container"

However, the system is actually booted in UEFI mode.

Verification

From the live environment:

ls /sys/firmware/efi
Result: Directory exists and contains files (confirms UEFI boot)

Optional additional check:

mount | grep efivars
Expected behaviour

Installer should:

Detect UEFI environment correctly
Proceed with installation without blocking
Actual behaviour
Installer incorrectly assumes:
Legacy boot mode OR
Container environment
Installation is blocked
Steps to reproduce
Create bootable USB using Ventoy
Copy omarchy-3.5.1-2.iso

Boot using:

UEFI: SanDisk / Ventoy
Launch installer
Observe EFI detection error
Additional notes

Disk was fully wiped prior to install:

diskpart
select disk 1
clean
convert gpt
No pre-existing partitions
Issue persists across reboots
Suspected cause
Incorrect EFI detection logic in installer
Possible incompatibility with:
Ventoy boot method
Limine bootloader environment
Workarounds tried
Verified UEFI boot manually → confirmed correct
Recreated USB
Ensured correct boot entry selection