Boost.Python error in job "bootloader"

Greetings Manjaro Forum
i had a problem installing the boot so i deleted manjaro and installed it again but this time i tried to install the boot on the desk SDA to make manjaro the master boot instead of windows.
so here's the error message ;

Boost.Python error in job "bootloader".
<class 'subprocess.CalledProcessError'>
Command 'grub-install --target=i386-pc --recheck --force /dev/sda' returned non-zero exit status 1.
File "/usr/lib/calamares/modules/bootloader/", line 342, in run

File "/usr/lib/calamares/modules/bootloader/", line 313, in prepare_bootloader
install_grub(efi_directory, fw_type)

File "/usr/lib/calamares/modules/bootloader/", line 283, in install_grub

File "", line 2, in

and here's the calamares debugging message :

sudo calamares --debug
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
21:15:01 [1]: Calamares version: 3.1.4
Translation: Calamares: Using system locale: "en_US"
21:15:01 [1]: Default font =====
Pixel size: -1
Point size: 9
Point sizeF: 9
Font family: "Sans Serif"
Metric height: 15
21:15:01 [1]: Font height: 15
21:15:01 [1]: Available languages: ("ar", "ast", "bg", "ca", "cs_CZ", "da", "de", "el", "en", "en_GB", "es_MX", "es", "eu", "fr", "he", "hr", "hu", "id", "is", "it_IT", "ja", "lt", "nl", "pl", "pt_BR", "pt_PT", "ro", "ru", "sk", "sv", "th", "tr_TR", "zh_CN", "zh_TW")
Calamares is already running, shutting down.
21:15:01 [8]: Shutting down Calamares...
21:15:01 [8]: Finished shutdown.

i tried to search in the forum but didn't find someone with the same error message, sorry for being so disturbing :frowning:

Try using Manjaro livecd to boot. Boot the livecd in bios-legacy mode (as you installed in bios-legacy mode)
As they link says,

Do not boot up to live OS, but press 'c' at the menu and we'll get to the grub prompt (grub>).

When booted up to Manjaro, at terminal,

sudo pacman-mirrors -g
sudo pacman -Syyu
sudo pacman -S grub
sudo grub-install /dev/sda
sudo update-grub

Good luck.

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