On Linux I like to make use of the select and paste feature i.e. selecting text copies it and the middle mouse button pastes it. When a laptop touchpad has no buttons a middle mouse click can be simulated with a three-finger tap, but this is awkward.
Here is my workaround (for keyboards with a numeric keypad only):
- From the Accessibility menu turn on Mouse Keys.
- Ensure the Number Lock is off.
- Select text.
- Paste text by pressing 5 on the numeric keypad.
Furthermore, in a terminal and some other applications SHIFT + INSERT will paste text which has been previously selected.
I am using Ubuntu 20.04.1 and GNOME 3.36.8