Ok, so yesterday I posted about some trouble I was having booting, getting the error "No boot device found.":

"No boot device found. Press any key to restart."

This thread is a progression of that one, but I am in a completely different place, and wasn't able to use the help I got to get where I am, so I though this warranted a new thread (if not I apologize).

Anyway, I think I figure out what my problem is, the original one and now (but I think the solutions are different). I believe that I accidently installed all of the previous distros on my hard drive in Legacy BIOS and then was forced to install Fedora 25 in UEFI.

This is where I'm at now. When I boot up computer, it UEFI boots into grub2 (because I finally properly installed Fedora). In grub, it lists all the distros I have installed, in all their glory, and Windows Boot Manager. Fedora and Windows boot up just fine. However, when I try to boot of any of the other distros, I get this:

Just a reminder, everything was installed in this order: Windows, All the other distros, Fedora.

I thought, screw it, since I've got it booting quickly into UEFI grub2 now, I could just delete all the partitions holding all the previously installed distros, and reinstall them UEFI now that I understand how, but when I went into BIOS to switch to Boot from USB, the only boot devices listed were Fedora, Windows, and System Setup. But when I use efibootmgr and list my boot devices, it has all the devices you would expect to be there.

So, unless I'm way off base, I think I have on of two solutions here, neither of which I know how to do.

1. Somehow edit my grub.cfg, or delete a bios partition, or linux swap, or something that allows all my older distros to boot from UEFI grub2.

2. Fix my devices that show up in BIOS so I can boot from USB, delete all the old distros, and reinstall them properly in UEFI.

What do y'all think? any recommendations?

If you need me to post any sort of read out, let me know, though I've got to step away from the computer for a couple hours, I'll be back at trying to figure this all out at around 9 pm eastern.

Thanks for reading all that and thanks for any help.

-Gander

Here is what shows when I lsblk:

And I don't know if it helps, but here is what one of the menuentry's look like in my grub.cfg for on of the distros throwing the error.:

Also, I thought it was worth noting, that though Windows is booting up fine, in the grub.cfg, it's actually pointed at boot/efi, not Windows partition which is sda5:

GanderBird,

Sounds like a job for BootRepair CD:
https://sourceforge.net/projects/boot-repair-cd/files/

General info:
https://help.ubuntu.com/community/Boot-Repair

Do make sure that all your data is backed up first.

You may prefer to create a Boot Info Summary and post it on LQ BEFORE doing the Recommended Repair.

More detailed information can be obtained by running the boot repair as suggested above as long as you select the option to Create BootInfo summary and do not try to make any repairs. The info you posted shows you are using GPT. My understanding is that windows with GPT needs a UEFI install which you have. Since you installed Fedora UEFI, that also boots. You may be able to boot the other systems if you can change from UEFI to Legacy/CSM in the BIOS. You would then not be able to boot windows or Fedora so you would have to make this change each time you boot to the other systems. You need to install them all EFI. The link below gives specific information on installing Ubuntu with a dual aboot windows UEFI. There are some general principles explained which should apply to any install.

https://help.ubuntu.com/community/UEFI

If you decide to reinstall the other systems, there is no need to delete the partitions, simply select a partition and format it during the installation.

Thanks for the heads up about Boot Info Summary beachboy, it helped put all the various information and various config files I've been screwing with for the last 48 hours all in one place. The only thing I can think of that isn't in the summary that I thought might be of interest was that when I was in grub and hit C to go to command prompt and ls to list all the drives something curious popped up. I thought (and was previously the case at one time) that all the partitions were on hd0. Now however, (I've got to look again, because I may be wrong about which partitions were on it) sda13 and 16 were on hd00 and all the other partitions were on hd1. And boy did I think I had it all figured out, I went into the grub.cfg the grub2 was loading from, and on all the menuentries after Fedora, I replaced all the root='hd0,-' with hd1. Still got the same errors.

Anyway, here is the Boot Info Summary, maybe one of y'all can help me make since of what's going wrong. I was really hoping I could repair it manually instead of running something automated like Boot Repair, just to help me understand everything that's going on there and to learn more about it, but I'm getting really tired and aggravated with it all, and my eyes feel like they are gonna bleed from staring at the screen for so long reading a million help files and forums and blah blah blah... So maybe I'll just run Boot Repair, and then compare the summary now to the one I get after and try and figure out what it did. Or maybe I'll keep studying stuff.