I have/had an issue where I'm able to install Solus 4 Fortitude onto my notebook, but can't boot (via UEFI) afterwards with the following error message:
"Error loading \EFI\com.solus-project\kernel-com.solus-project.current.4.20.16-112: Not Found" "Failed to execute Solus 4.0 Fortitude \EFI\com.solus-project\kernel-com.solus-project.current.4.20.16-112: Not Found"
Someone on my Flarum post regarding this issue suggested just installing Solus 3.9999 and upgrading to 4.0. This worked until I ran another full upgrade of the system a few days later. Now I'm not able to boot into my Solus installation except when I switch the Kernel pre boot.
com.solus-project.current.5.1.7-119 [DOES NOT WORK]
com.solus-project.current.5.0.5-113 [DOES NOT WORK]
It seems that no Kernel above 4.20 works.
After fiddling and looking into several other posts this seems to affect different types of Motherboards from Acer. (another Flarum Post). Here is another user with a similar problem (I don't know if he has Acer too): third flarum post
I can't change the "standard" boot kernel via clr-boot-manager update. I get an Error "Bus Error" (please see comment for Log with CBM_DEBUG). So the only workaround for me atm is to change the kernel during boot (switched the default kernel to the 4.20 one.
Sadly I'm not able to troubleshoot this issue any further without advice. Please tell me what more info you need to investigate this issue.