I have a doubt, there is a free program to share mouse between linux and windows, I have a PC and a laptop, on the laptop I have w10 and ubuntu mate 18.04, and the pc w10, when I use the PC and laptop with w10, I use the windows software called "Mouse without borders" but it is only for windows, I am looking for a free one for linux and windows, I know that there is sinergy but it is paid
There used to be small print on the Synergy website stating that the payment is to download synergy. It's still open source, and you
can might be able to build it yourself, but it might need proprietary binaries.
Use barrier. It is free and open source, was forked from synergy. It is amazing.
In ubuntu 18.04 the best way to install seems to first install flatpak:
And then barrier using flatpak: