I installed this LastOSLinux issue on an old Macbook 2008 'White' model.
When booting Ventoy drive, it shows for a second that message about 'not a secure boot platform 14' but then the Ventoy menu reliably appears.
Choose grub2 option if the normal mode doesn't boot (as is likely on most or all macs).
Before starting the installation, you need to boot into Mac OS and reduce the mac partition to make space for Linux (unless you decided to do away with mac os altogether). You can't shrink it in this Linux dialog, only delete it.
The first FAT32 EFI partition 'belongs' to Mac OS, I ignore it and make my own for Linux.
Final review of partition setup before actual installing.
As you see, I had previously installed Mint 22.1 on this old Macbook and the same as Glenn had it on his old mac install, I also experienced extra long booting times, even 10-12 minutes long ones (sometimes it was shorter if picking Linux EFI boot partition manually while holding Alt at startup but it didn't always shorten the boot).
Moving ahead, this Mint22.2 reliably starts in 75 seconds from pressing the power button to desktop loading. I wonder if that previous overlong boot time might have been because apparently (as seen in this image) I used that sda1 mac boot partition vs now that I have more experience with installing I make my own linux boot partition.
Installation took a bit over 12 minutes and on first boot you get this generic Ubuntu menu
After first reboot (you may have to disconnect Ventoy disk to avoid booting into its menu). I then plug the disk back before it gets to the desktop but likely it is not like that LastOSLinux needs it to get something out of its iso, I think it couldn't, it is not like when you 'burn' iso to usb device and then it is used for post install installation, here it is all likely downloaded from the internet (just have internet cable plugged in, decidedly you need it for latest updates anyway). For WIFI you need to use
USB dongle.
New lease on life for 13" MacBook4,1
(White-Early 2008), A1181, Core 2 Duo 2.4GHz (T8300) Intel CPU, 4GB 667MHz RAM, 500GB SSD
I believe I got this Mint 22.2 boot menu on subsequent boots by installing 'custom grub boot menu' from LLStore.
Those two Mac OS choices don't work, just hung up your machine. To boot into mac OS hold Alt key at startup to choose its partition (if you left its partition on disk). If you don't press any key, you always boot into Linux even if you previously booted Mac OS, Linux is the default.
@Glenn Hope this 'use case' fits in here or move it to some other section. I recall now that you said you installed Mint 21 on old macbook for your mother and there was that issue with long startup times, you should then reinstall it with this Mint 22.2 if you didn't do that already.