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I suppose I shouldn't feel silly having so much trouble. I havn't had my hands on a keyboard since 1995. I bought a new Lenovo Thinkpad L380 with Win 10 Pro installed. I want to install Linux in a dual boot configuration. I thought, perhaps my trouble was due to my copy of Mint, so I also tried Kubuntu. I disabled secure boot. Installed Kubuntu manually (partitions) with 60GB partition mounted as root (btrfs) and 32GB as swap. The installation program claimed success. I can see the files but GRUB didn't install, I can only select ubuntu after pressing Enter and F12 to get the system boot loader. Yes, ubuntu is an option but selecting it has no effect. The Mint installation was the same except the partitions were formatted as ext4.
I appreciate any assistance offered. I've spent hours on the net trying boot-repair, bcdedit, disabling CSM, really anything I could find. THANKS!

oldfred- Thank You for yor response.

Kubuntu 18.04 Disk Setup does not have an option for ext4 (10 other options)
I live booted from USB and used KDE Partition Manager to change the file type to ext4. Also, checked for updates and Microsoft tells me I'm current.

so, I tried again. This time, Kubuntu Installation didn't like my partition as "No root file system is defined" I choose the option of resizing my windows partition and letting the Installation program run in guided mode rather than manually.

Again, the installation was claimed as a success. Windows still boots too.

When I interupt the boot (Enter+F12) and select "ubuntu" I get nothing. Just a pause long enough to suggest a cycle looking for something

@ubfan1 Thank you for your response!

The BIOS Revision is 1.19 dated 2019-02-19
Unfortunatly, I was'nt able to gain access at that URL. Nor was I able to find any information on anything more current. Is it significant I am using an SSD?

Thanks again

Scratch that. I did get the info and my BIOS is the most current.

again, Thank you

I've had a pretty interesting morning double checking the suggestions I've recieved.

I fixed all the partitions that had been created on the SSD. Then tried to reinstall Kubuntu - sucessfully - installed! I can live boot the USB and navigate to the SSD and see all the files. Look, there they are!

Well, not all of them. One suggestion mentioned making sure /etc/fstab had a pointer to /boot/efi ... so, there is no "fstab" in /etc

and yes, Kubuntu was installed in EFI mode

one suggestion mentioned "bcdedit /set {bootmgr} path EFIubuntushimx64.efi" in windows. There was a problem there. "the set command specified is not valid"

that got me thinking, maybe I could just edit the file like we used to do in the old days. There is no EFIMicrosoftBootbootmgfw.efi on the drive. No file, No such directory (sorry, folder) I did find 67 instances of the file "bootmgr.exe.mui" in C:WindowsWinSxSx86-microsoft... 67 instances! I don't know what it is. Just made me remember how much I love windows!

Other than that, everything else remains the same. ubuntu selection is available in the boot menu. Does not load ubuntu. The boot order has ubuntu listed first but is ignored and windows loads as they prefer.

@oldfred Thank you so much for being willing to help. I appreciate it.

I'm not sure what you mean by ppa version with live installer.
I did try opening a terminal and the following commands:

sudo apt-get repository ppa:yannubuntu/boot-repair

sudo apt-get update

sudo apt-get install -y boot-repair && boot-repair

as I remember there was a problem with repository so I did download an ISO of boot-repair and tried it, to no avail.

Please, as I'm a noob I need just a little more details on "ppa version with live installer"

Thanks again

OKAY! I really appreciate the community help. Took awhile, had to re-download boot-repair the pastebin is:

http://paste.ubuntu.com/p/RK3RP8fYTH

Thanks again

I don't understand too much more of the boot-repair report beyond the entry: Syslinux looks at sector 32800 of /dev/sda1 for its second stage. The integrity check of Syslinux failed.

One of my personality flaws is that I'm impatient. So, while I'm waiting for one of the persons in this forum (who I suspect will have the real answer) to respond, I thought I'd keep looking elsewhere. Interesting post at http://neosmart.net/wiki/easybcd/uefi/
"microsoft has blocked the loading of legacy or non-windows operating systems from the BCD menu"

I can't tell you how much I look forward to resolving this issue and spending time in Ubuntu rather than Windows.

The boot section of my startup menu is configured as such:
UEFI/Legacy Boot Both
-EUFI/Legacy Boot Priority UEFI First
-CSM Support Yes

The boot order has Ubuntu listed first. Is this conflict between UEFI First and
Ubuntu the reason I'm not able to install a version of Ubuntu that loads?

Thanks for helping those of us a little new and old at the same time.

@oldfred -I really appreciate you sticking with me on this!

Doesn't matter whether I set EUFI/Legacy to both or to UEFI only. I still have the same problem. Windows is the only OS that will boot from the SSD. Even though Ubuntu is set first in the boot load order, doesn't happen. Selecting Ubuntu from the boot menu has no effect. Yes, fast boot is off, so is secure boot. I can boot Ubuntu from the USB and run it live.

I received a suggestion from a Microsoft MVP volunteer on a forum:
"Use the advanced options and load GRUB to the actual Linix partition, rather than the System partition, and use EasyBCD to add the GRUB loader to the Windows bootloader."

Truth is, I don't really track that. Advanced options in? Never saw options for installing GRUB manually. So, I'm still temporarily stuck.

More good news. Looking for an Easy (pun intended) solution to my issues I tried EasyBCD as the Microsoft guy suggested. I just pulled up Disk Management, wanted to confirm the partition Ubuntu is installed on, and found that I now have FOUR additional OEM partitions of 0MB ea. for a total of 8 partitions. Furthermore, I can't select and delete them.