I installed Ubuntu on my Acer aspire f 15 laptop using option "erase the disk and install Ubuntu". it erased the entire disk and installed Ubuntu successfully. but when I restart,I sow the message "no bootable device". I entered bios to change the order of booting but Ubuntu name is not there to change its order! I tried boot-repair and it gave me the link and a message "please do not forget to make your BIOS boot on sdb1/EFI/ubuntu/shimx64.efi file!"
I don't know what does this message says and I don't know what action i should take.
note:Ubuntu is installed alone on my laptop.
any help is appreciated.