Dual boot Ubuntu MATE with Windows 11 (win11)?

[josephus]

Here is the answer from ACER: : I should have looked there first.

1. In Bios disable secure boot
2. save Bios settings and shutdown pc
3. reboot pc....press F12 when prompted
4. choose UEFI NOT windows manager
5. you'll get the win11 or Linux menu choices. (looks like GRUB)
   Simple and done!

For safety: next time you reboot set secure boot to enabled in Bios and save