How to leave Windows 10 and get back to Ubuntu?

Question

After visiting the original Windows 10 on my dual boot laptop after several months, I'm not able to get back into Ubuntu.

I already have Fastboot disabled, and no Shift + Click shutdown or running a shutdown command from the command line won't help me.

It always boots back to Windows.

I am voting to close this question as a duplicate of Windows 10 changes UEFI boot order every time that you have linked in your answer. — user68186, May 24 '21 at 19:57
Does this answer your question? Can't boot into Ubuntu in Windows 10 / Ubuntu dual boot — karel, May 25 '21 at 07:38

score 0 · Answer 1 · answered May 24 '21 at 19:32

The issue was, that when Windows was loaded (or maybe updated) it switched around the boot order in the UEFI settings.

For a one-time solution, I was able to go follow this guide
How to enter UEFI (BIOS) on Windows 10 PCs | Windows Central
to get to UEFI:

in windows 10
Settings > Update & Security > Recovery > Advanced Startup > Restart now

on blue screens:
Troubleshoot > Advanced options > UEFI Firmware Settings > Restart

This got me to a UEFI menu where I could find out the boot order was switched to:

Swapping them around, saving and restarting got me back to where I could select Ubuntu.

For a more permanent solution this answer goes into more detail:
Windows 10 changes UEFI boot order every time - Ask Ubuntu

1 Answers1