This is a new bug. You can see how it gets processed, reported on, and acted on:
This is the kind of bug we'd never want to get into an official published release. You can check it now and again to see the progress.
Fortunately, this bug is about when you *install* Lubuntu/etc. I do not do the installation tests. I do the live tests. It means 'snot up to me to work on this one. There's also enough confirmation that anything I'd add won't help. Still, it means I get to take it easy with this bug. It's a short day of testing (which I'm late doing).
I figure it may be interesting to see.
Bug #1955109 “boot menu not appearing after manual install of je...” : Bugs : grub2 package : Ubuntu
desktop amd64 PC, UEFI, 8 core processor, 16gb RAM, nVidia graphics card, several ssd's manual install of Kubuntu Jellyfish to a partition on ssd alongside Kubuntu Focal LTS I am testing an installation of Kubuntu Jellyfish daily build alongside Kubuntu Focal 20.04.3 Usually this proceeds...
bugs.launchpad.net
This is the kind of bug we'd never want to get into an official published release. You can check it now and again to see the progress.
Fortunately, this bug is about when you *install* Lubuntu/etc. I do not do the installation tests. I do the live tests. It means 'snot up to me to work on this one. There's also enough confirmation that anything I'd add won't help. Still, it means I get to take it easy with this bug. It's a short day of testing (which I'm late doing).
I figure it may be interesting to see.