I'm new to linux, so definitely not the best person to answer. But since nobody else has answered at all, maybe this will help a little.
For the touchpad problem:
Which desktop environment are you using?
In XFCE, there is an option in
Settings --> Mouse & Touchpad --> Devices
for Device, choose the Touchpad option
click the Touchpad tab
you can now adjust Sensitivity* (under the Buttons & Feedback tab) and
click "Disable touchpad while typing" (under the Touchpad tab)
In Ubuntu, according to this community help manual page:
Basic Configuration with a Graphical Interface
provides configuration of the most common touchpad options in System > Preferences > Mouse
, under the Touchpad tab. If you cannot find this tab, see the Troubleshooting section at the end of this page.
Try the touchpad after unchecking the Enable mouse clicks with touchpad
Check operation after Enable horizontal scrolling
is checked. This may not have been the default setting.
Disabling Touchpad while Typing
Go to System > Preferences > Mouse > Touchpad and uncheck 'Disable touchpad while typing' and 'Enable mouse clicks with touchpad'
LXDE (eg lubuntu) doesn't seem to offer a similar way to set touchpad settings from the settings menu, as far as I have been able to tell. A workaround might be to use the syndaemon command in a terminal, as mentioned here:
*edit: I just noticed after I posted this that you already mentioned you had adjusted the sensitivity that way