I have installed last Balena Etcher and did a USB flash install of Lubuntu lubuntu-18.04.3-desktop-i386. I also did a Debian 10 that boots normally through the same process. Why Debian works where Lubuntu don’t?
These are the screens I got. The first one don’t come when Debian is attached, it boots directly.
So I order it to boot from USB flash drive…
…second image not allowed. It says…
Starting legacy loader
Using load options ‘USB’
The firmware refused to boot from the selected volume. Note that external
hard drives are not well-supported by Apple’s firmware for legacy OS booting.
- Hit any key to continue *
…and than hangs!
My mac mini is a mid 2007 1.83GHz with 4GB or RAM. I have two partitions: Mac OS X Lion and Windows 7 - both unsupported systems. Though will keep Windows, maybe try upgrade to 10 and install some Linux in the Mac partition.