Invalid configuration: root partition not found” with encrypted root, even when root is correctly mounted

[tanvir366]

Which ISO version are you using?

https://fastly.mirror.pkgbuild.com/iso/2026.01.01/archlinux-x86_64.iso

The installation log

ryzen 7 9700x
nvidia RTX4060
nvme

describe the problem

While installing Arch Linux using archinstall with an encrypted (LUKS) root partition(pre- mounted configuration), the installer showing the error:

"Invalid configuration: root partition not found"

This happens even though the root partition is correctly opened, formatted, and mounted at /mnt, and the EFI partition is mounted at /mnt/booti.

Manual verification confirms that the root filesystem is present and accessible, but archinstall fails to detect it.

Please let me know if there is any solution to this problem. I am unable to use my PC due to this.🫪

[Torxed]

Could you attach your log as well?

[h8d13]

Did you also set the boot flags in the manual menu ?

[krid78]

I face the same issue. I have a slightly more complex disk layout. Everything is mounted, filesystems ar formated and writable.
I tried /mnt als well as /mnt/archinstall as the root.
Flags on my boot partition are set (boot, esp).

You find the log at https://0x0.st/PTbS.log