Sorry about this as I'm sure it's a FAQ. I've already checked the suggestions on here.
I have a HP ProBook pre-installed. The first thing when I got the laptop - about 2 months ago - I did was install the current version of KUbuntu. Everything went fine and I've had 2 lovely months of using it.
Today I had to boot Into Windows which was option 4 on my GRUB menu. That worked fine, and I shut down when I'd finished what I was doing.
However, when I boot up now I no longer get the GRUB menu appear, and the laptop goes straight into Windows 11.
Can anyone please point me at the instructions on how to re-instate the GRUB menu. I'm guessing it's still in place, but is being bypassed by the laptop during bootup.
I've tried various function keys at bootup to see if that helps, but I haven't managed to find anything.