I've had two hang-ups with install
#1 I like the installer text interface - a graphical one is asking for platform trouble ... ie the following
I installed Linux UEK `to run mathematica` so i though. RH demanded to be "the King" of bootloaders. I decided OK, let it, I'll install FreeBSD 13 after! FreeBSD did NOT make the ?pmbr? and when I booted from BIOS I got redhat bootloader. ugh! I later found i can't use redhat it's borne with nouveau to prevent nvidia driver install (and other bad things, so am deleting redhat). I fear ubuntu will give me the same lines of hastling my card (I already checked: they do obstruct).
1) The boot loader didn't inform me if I am BIOS or UEFI booted. I had 0 idea that would "be a problem with other os _later_". Didn't warn me it would not be able to boot without pmbr before installing and didn't suggest making one. Good news is that it didn't refuse to go forward like RHEL did!
2) It is _difficult_ to boot from USB (no clear way to boot HD install from USB). Booting from USB has advantages of "staying out of the who is king of the disk image boot list game". And is necessary if for any reason the amazing pmbr or uefi magic is ... no joy. For 100 reasons I so like booting from inserted USB. There is no best bootloader imho because none of them play nice with "all systems all versions", so it's always a hack.