Touchbook 15" i7 - touchpad & PacketTracer 7.3

Hello Kind readers !

After reading many posts and tyring many solutions, I decide to write here.
I hope it may help improving this enjoying Ubuntu Mate... and myself !

I report you :

  1. a(nother) "non working touchpad" problem, after installing U.Mate 20.04 (dual boot with Windows 10 64 pro, on a besides partition).
    NB : F6 button or "touchpad-indicator or desabling mouse don't change anything.

  2. a(nother) "installing PacketTracer 7.3.0" problem, because of "qt-at-spi unsatisfied dependances"...

Thank you for your enlightning answers !