1) For some years motherboards have offered two boot modes. A newer UEFI
mode and an older BIOS/Legacy/Compatibility Support Module mode (CSM).
This was necessary because Windows 7 could only boot in Legacy mode. So,
you have a motherboard setup to boot an OS installed in Legacy mode.
2) If there are two or more OS on the machine then all OS must be
installed in the same mode. Either UEFI or Legacy mode. Otherwise only
one OS will load.
3) How we load the ISO image is how the OS installs. Load the Ubuntu
iso image in UEFI mode and Ubuntu will install in UEFI mode. Load the
Ubuntu iso image in Legacy mode and Ubuntu will install in Legaqcy mode.
3) You must have installed Ubuntu 20.04 in Legacy mode. Otherwise the
motherboard would not have loaded it. The motherboard is set to load an
OS installed in Legacy mode.
4) You must have installed Ubuntu 22.04 in UEFI mode. That is why the
motherboard did not load it. Until you entered the UEFI settings and
selected Ubuntu 22.04.
5) If you wish Ubuntu 20.04 and 22.04 on that machine then you should
re-install 20.04 in UEFI mode.
Regards grahammechanical (Ubuntu Forums)
On 16/10/2022 20:25, Ian Bruntlett wrote:
Hi,
On Saturday, I was working on a Viglen Genie computer with Windows 7 on. So
I booted dban and wiped the SSD, booted memtest86+ and verified the RAM was
OK.
Then I installed Ubuntu 22.04.1 on it. No problem.
So I decided to install Saturday's 22.10 daily spin. It installed fine.
Then I rebooted and the system suddenly seemed to have lost its SSD drive.
Cue panic.
So I wandered around the BIOS setup program and ended up at the "Boot"
submenu. The entry for "Boot mode select" was set to "LEGACY" so I looked
at it, found out that it could also be set to "UEFI". I set the system for
"UEFI" and the computer started booting again. Has something changed?
TIA,
Ian
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