No Bootable Device After Install manjaro 18

Good morning

i have just installed manjaro 18 as my main os in my notebook (Acer 4738Z ram 4gb), i made 3 partitions (swap, root, and home), the installation was succesfull, at the time of restart an error occurred. error is “Failed to unmounting /run/miso/bootmnt” and when i try to reboot my notebook "no bootable device -- insert boot disk and press any key' .

maybe this is a mainstream topic for newbie, but seriously i have no idea, i read similiar thread about this problem but i still confused, here is the thread that i read.

Using livecd v17.0.1 (and above) as grub to boot OS with broken bootloader

Failed to unmounting /run/miso/bootmnt

thank you

You referred to the first link, in it it ask you to provide certain information if you have difficulties.
Can you do that? Bisa?

Secure boot disabled?

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