fix

efi_directory is always set to a value (defaults to /boot/efi) even on a BIOS/CSM/Legacy-only system.
The function is guarded elsewhere to prevent installation of a bios bootloader on UEFI.

PKGBUILD

@@ -4,7 +4,7 @@
 _pkgname="calamares"
 pkgname="$_pkgname"
 pkgver=3.4.2
-pkgrel=1
+pkgrel=2
 pkgdesc="Distribution-independent installer framework"
 url="https://codeberg.org/Calamares/calamares"
 license=("GPL-3.0-or-later")
@@ -28,7 +28,7 @@ makedepends=(
 _pkgsrc="$_pkgname"
 _pkgext="tar.gz"
 source=("calamares.zip")
-sha256sums=('9d59a1e630f7ee99b9668b8356f8ab0fe152092ca2d4f01e4c86d79819b414b8')
+sha256sums=('57b3b36d8cf67393ee8e81871106b2f4a5925c120173f92c6d77c8f6003f79d5')
 
 build() {
   local _skip_modules=(

calamares/src/modules/bootloader/main.py

@@ -639,12 +639,7 @@ def run_grub_install(fw_type, partitions, efi_directory, install_hybrid_grub):
                                    "--force"])
     else:
 
-        libcalamares.utils.debug("run_grub_install------else bios 1")
-        if efi_directory is not None and not install_hybrid_grub:
-            libcalamares.utils.warning(_("Cannot install BIOS bootloader on UEFI installation when install_hybrid_grub is 'False'!"))
-            
-
-        if libcalamares.globalstorage.value("bootLoader") is None:
+        if libcalamares.globalstorage.value("bootLoader") is None and install_hybrid_grub:
             efi_install_path = libcalamares.globalstorage.value("efiSystemPartition")
             if efi_install_path is None or efi_install_path == "":
                 efi_install_path = "/boot/efi"
@@ -655,7 +650,6 @@ def run_grub_install(fw_type, partitions, efi_directory, install_hybrid_grub):
                 return
             boot_loader_install_path = "/dev/" + boot_loader_install_path.split("\n")[1]
         else:
-            libcalamares.utils.debug("run_grub_install------else bios 1-1 ")
             boot_loader = libcalamares.globalstorage.value("bootLoader")
             boot_loader_install_path = boot_loader["installPath"]
             libcalamares.utils.debug(f"boot_loader_install_path: {boot_loader_install_path}")
@@ -666,7 +660,6 @@ def run_grub_install(fw_type, partitions, efi_directory, install_hybrid_grub):
         # boot_loader_install_path points to the physical disk to install GRUB
         # to. It should start with "/dev/", and be at least as long as the
         # string "/dev/sda".
-        libcalamares.utils.debug("run_grub_install------else bios 2")
         if not boot_loader_install_path.startswith("/dev/") or len(boot_loader_install_path) < 8:
             raise ValueError(f"boot_loader_install_path contains unexpected value '{boot_loader_install_path}'")