MyNameIsRichard

I've never tried modal vim because I've only just heard about it. The next thing I'd try is restarting the computer. Or Ctrl + Q whichever's easier.

Given OP mentions kebab-case, this is probably about file-systems. But you are absolutely correct about code.

Kebab case with Pascal case in the usual places. I'd change to all kebab case but the muscle memory of typing Documents would nearly kill me.

And yet, here you are posting on it.

The only other thing I can think of is, are you absolutely sure the key is the right type, efi or mbr, depending on how you're booting?

I do suspect a small but vocal crowd of people will spread doom and gloom about it on social media anyway, of course.

I see they're here already

Or you can use nmtui if you prefer a graphical frontend

their very liberal customization options

That's a good point and makes it worth considering

Some uefi set ups have usb boot disabled by default. It may be worth having a poke around and seeing if yours does.

How did they end up thinking that everything must be done with terminal while using Ubuntu?

When asking for help in a Linux sub/forum/community, the answer will generally use the terminal because it works across desktops and even distros. It's a lot easier to give one or two commands than it is to work out what distro, what desktop, and what settings the querier has, then describe the steps necessary in that particular GUI.

This may lead to the impression that the terminal is required for day to day use of Linux.

Arch and NixOS is where it’s at if you want bleeding edge.

openSUSE Tumbleweed if you want bleeding edge also

I'd been dual booting with Windows 2000 Professional for a while but XP came out, I didn't like it so fully switched.