I have SOLVED my problem.
efibootmgr -v <enter> shows the boot options (F12)
efibootmgr -o <enter> means make changes
Output before changing:
user@user:~$ efibootmgr <enter>
BootCurrent:0000
Timeout: 1 seconds
BootOrder: 0000,0002...
bcdedit /set "{bootmgr}" path "\EFI\systemd\systemd-boot.efi"
is another possible solution I found. But it needs more knowledge before executing this kind of changes.
Acer Aspire does not. I tried the program efibootmgr. Its not very diffcult to make changes. The problem is that after saving the changes, during reboot these changes get lost.
I have installed Linux on extern ssd Samsung EVO drive with USB connection.Have done this before (Windows 8.1 and Ubuntu 18.04 dual boot). Cant see Ubuntu in Bios, only Windows boot manager.
But I will check it again. I have checked 4 options: windows boot manager, removable drive, cdrom...
The first thing I see after booting my desktop is login screen Windows10. When I hit F12 I can choose between Windows or Ubuntu. When I choose Ubuntu the grub menu comes up. So I have to configure grub while there is a grubmenu. Ill try.
I succesfully have installed Ubuntu 20.04 alongside Windows 10 dual boot.
However, when I start up my desktop Windows10 shows up.
But, when I during startup hit the F12 function key, I get the option of choosing Windows boot manager (first on top) or Ubuntu (second).
When I choose Ubuntu, the...