Ubuntu 20.04 keyboard Shortcut [closed]

In a default Ubuntu install, Ctrl+c copies text from almost everywhere, including browsers. Ctrl+v pastes text in any application that supports the clipboard.

Also in the file manager, information about the selected files is copied to the clipboard. When pasting in the file manager, that information causes the files to be pasted in the current folder. Switch to the text editor and paste there to see what the file manager puts on the clipboard.

That is for a default install. If that does not work for you, then there must be a specific cause such as some configuration you performed or a hardware issue.