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Ubuntu 21.10 BIOS mode requires F10 sequence to boot

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Unless I use F10 and select an option, I get a no bootable disk message from my BIOS. If I press F10, when the screen says, "Please select boot device", I can select the hard drive and the Ubuntu boot screen proceeds normally.

Only 21.10, Budgie 21.10, and unsupported 22.04 show this problem. I’ve installed separate disks with other operating systems without any problems. Ubuntu 20.04, Mint 20.1, Zorin 16, and Fedora 35, all work fine. I have disabled UEFI in my BIOS and I have also tried the "Something Else" option during installation. I've followed the Ubuntu Handbook for installation.

My hard drive has only 2 partitions: "sda1 core.img and sda2 ext4 /". How can I boot Ubuntu without having to use F10 and select the appropriate drive?

Mr Spock avatar
th flag
SOLUTION FOUND for Ubuntubudgie 2110. (It should work here too.) Using gdisk, I found that the disk was still in GPT mode in spite of my changes. I then started over and using gparted created the following MBR disk table: sda1 fat16, sda2 swap, sda3 ext4 root, sda4 ext4 home. I then did a fresh install of Budgie 21.10 and chose “something else”. I had to bypass 5 error messages trying to convince me that EFI was missing. (I knew that!) The install went normally and the computer boots and works perfectly. Note: there is an option in gdisk to convert GPT to MBR but I couldn’t make it work.
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