tuxfanatic truly gut-wrenching story as your poor narrator (me) has seen this "sad face" screen a couple times.
When you get the sad face you are d-e-a-d.
You got sad face by shoehorning foreign packages into system files. My sad face comes from normal stuff like opening an email or or launching an app or nautilus work. Neither here nor there.
Josh gave you some advice but you were too impatient to try it. I understand, I am totally that way too: fix mode.
So you re-install. You make aother live usb. Instead of the normal "stuck at examination of device" (whatever) error that's common, you get an error I never heard of: "kernel in use"? Something is occupying the kernel outside of the live usb?? Huh??
I assume you shut down when you 'plugged out' your usb and rebooted. The "can't find a disk to mount" screen is a classic bios. A greatest hit. An oldie but a regular goodie, like Free Bird.....it means boot record gone or usb never installed this. you got this.
so......you tried a mystery app to burn yet your 3rd live usb and had success. As a result you had success in reinstalling solus proper. A reboot, as you specified at the end, suprsingly cures a lot.
You know what was really unusual about this story? Nothing 🙁
I'm a 3-4 yrs linux noobie and this is so Linux. It creates an ulcer but it does not create an ulcer in the ballpark of using win****s. But I'm not ever going back to MS world, like you, so there's that pioneer appeal with the big penguin🙂