<div style="color:black;font: 10pt arial;">I have searched the web and what I have found (including the Ubuntu RAID guide) is either outdated or wrong. In the installer (either the default or updated one):
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<div>If I select "Use as Boot Device" for a device then the device is not shown as a device for "Create Software RAID"</div>
<div>If I select "Use as Boot Device" for a device and "Add GPT Partition" (to create an unmounted partition for root) then I can't select a specific partition in "Create Software RAID"<br>
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<div>If I create a software RAID (mirroring) first then it can't be selected as a boot device</div>
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<div>All I have is terabyte size devices and can't afford to dedicate one as a bootable device.</div>
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<div>I'm now looking at installing Ubuntu without RAID then attempting to create a RAID of root after reboot but I can't seem to find how to do that either.</div>
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<div>Can you provide instructions (or a URL to same) for either method? Thank you for your help.</div>
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