https://bugs.winehq.org/show_bug.cgi?id=39303
--- Comment #3 from testelor@yahoo.com --- (In reply to Dr. Ing. Dieter Jurzitza from comment #2)
This is not true. I can say "duplicate" in one ltspice - pane within windows, mark the corresponding elements, switch to the other window pane (containing a different schematic) and paste the duplicated structure by Strg - V. Try on your own, this works flawlessly in windows. Attempting to do the very same action within wine does actually not work for me, (same version of ltspice, of course!). This is the reason why I opened this bug. I am using the latest version of ltspice as available from the main download site.
Have you tried with my suggestion:
[...] only from two schematics within the same instance (even then, with Wine, you need to tile or cascade the schematic windows, or similar, they must not be both maximized).