我最近从 19.10 升级到了 20.04。我注意到书写时禁用触摸板设置在 GNOME 桌面环境中不起作用。它在 Tweaks 中处于“开启”状态，但没有变化。我的键盘相对较小，当我打字时，手掌会触摸触摸板，光标会移动到整个屏幕上。xserver-xorg-input-synaptics 和 xserver-xorg-input-libinput 都已安装。我还能做什么？
$ apt search synaptic
Sorting... Done
Full Text Search... Done
apt-cacher/focal,focal 1.7.20.1 all
Caching proxy server for Debian/Ubuntu/Devuan software repositories
muon/focal 4:5.8.0-1ubuntu5 amd64
graphical package manager
packagekit/focal-updates,now 1.13-2ubuntu21 amd64 [installed]
Provides a package management service
steam-installer/focal,focal,now 1.0.0.61-2ubuntu3 all
Installer for Valve's Steam digital software delivery system
synaptic/focal,now 0.84.6ubuntu5 amd64 [installed]
Graphical package manager
xserver-xorg-input-libinput/focal,now 0.29.0-1 amd64 [installed]
X.Org X server -- libinput input driver
xserver-xorg-input-synaptics/focal,now 1.9.1-1ubuntu3 amd64 [installed]
Synaptics TouchPad driver for X.Org server
xserver-xorg-input-synaptics-dev-hwe-18.04/focal-updates,focal-updates 3:14.5 amd64
Transitional package for xserver-xorg-input-synaptics-dev-hwe-18.04
xserver-xorg-input-synaptics-hwe-18.04/focal 3:14.5 amd64
Transitional package for xserver-xorg-input-synaptics-hwe-18.04