I have a dell computer (Optiplex 790). I pressed the eufi thing and that was a real mistake. I thought it would be easy to set it back. every time i try I cannot get to the place to change it back. I was wondering if anybody might have a solution to this one.
Thank you…
If you turned UEFI Secure boot on, then you cannot use BIOS/Legacy/CSM boot mode, even for USB flash drive. As BIOS is not UEFI Secure.
CSM - UEFI Compatibility Support Module (CSM), which emulates a BIOS mode, only available with secure boot off.
There may be other settings in UEFI/BIOS that control USB ports. Check for allow USB boot or full USB support type entry,
With Ubuntu only you can use the improved gpt partitioning over the very old MBR(msdos) partitioning. Windows requires MBR with BIOS installs, so if dual booting you must keep MBR as conversion from MBR to gpt erases entire drive. But if Windows was UEFI then you have gpt drive as Microsoft requires gpt with UEFI installs by vendors.
When first converting from BIOS to UEFI, I added both the ESP - efi system partition for UEFI boot and the bios_grub partition for BIOS boot on gpt drive, so I could just reinstall grub in different boot mode, not reinstall or totally repartition entire drive.
Today I thought I would take another run at my computer. I still couldn’t get to settings to fix it but I went through the options for everything. One was to reset the system to its regular settings. I pushed the button and kept on messing around. I finally stopped, fixing nothing. Then noticed that my connection was not right. I fixed that and went on. This time it actually ran fine. I am using it, right now! Weeks wasted! I had no idea! I had read a lot of ways to change what I needed and got answers from a lot of people AND Dell! Nobody ever mentioned the setting it back to what it considered normal, including me.
Anyway, solution!!!
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