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Linux running X11 has 2 clipboards:

• oldschool ( from terminal-only era ) => copy by selecting text (mostly in terminals) and paste using middle mouse click
• more modern new style ( based on graphical interfaces ) => copy by ctrl+c (or ctrl+shift+c in terminals and such) and paste ctrl+v (ctrl+shift+v in terminals ...)

Normally both those clipboards work independent as they are handled by 2 different processes, so you can for example copy one text using ctrl+c and copy another text by only selecting second text, then you can paste both, one with middle click, second with ctrl+v

More and more distro have a clipboard managers that have a feature to "sync" both clipboards, but it's a lot of time disabled because it's more confusing people and sometimes annoying. Why it's confusing and disabled by default? Imagine that you selected some text, then did a ctrl+c, you move to some word document, select text, remove it, and want to Paste it. Guess what, the selecting you did to remove text did copy the selection to clipboard overriding what you did have there from ctrl+c.

Most if not all terminal emulators (konsole, gnome-terminal, xterm) support both clipboard styles, old-school select to copy, and new one but because the "ctrl+c" shortcut reserved to stop/interrupt applications they all decide to use ctrl+shift+c to do a copy. And yes, not only terminal emulators use ctrl+shift+c, I did have few encounters on some random apps, but most of the time, if ctrl+c is used for something else, ctrl+shift+c was available.

1. Tries to use Windows conventions on Linux, without bothering to learn the differences. A 30 second Google search would suffice.
2. Fails.
3. Posts a rant blaming Linux for "not working properly".

Have you tried ctrl+shift+c to copy from terminal?

Terminal shortcuts to copy and paste are different, because ctrl+ may be a command

I have an issue that clipboard content is application dependent.

So many times, I will open a program to find some text, Ctrl+C to add it to the clipboard, close that program because I'm done with it, switch to the second program, push Ctrl+V, nothing happens because closing the first program cleared the clipboard's content when closed.

Is this inherent to Linux, or could using something other than KDE fix it?

Others have covered PRIMARY vs CLIPBOARD (the separation of which I find to be extremely useful).

For Vim, you have access to these both via the registers + (CLIPBOARD) and * (PRIMARY). So, for example, to paste from your CLIPBOARD selection, you'd do this:

"+p

(or P). Similar for yanking:

"+yy

for example.

Linux has 2 clipboards. You're mixing the two. https://askubuntu.com/questions/1167856/two-clipboards-possible

What I'd like to see is a clipboard history which pastes the content into cursor with just mouse click/enter.