I am new to ubuntu so please keep that in mind.
I installed ubuntu 18.04 LTS on my Thinkpad L540. Most often my mouse cursor, if I use my touchpad, is laggy/choppy in a visual way. This does not happen if I use an external mouse (bluetooth). Everything else is working fine (fluid/without lags). After some reboots, it sometimes works.
I take the notebook with me and I often cant use a bluetooth mouse, so I am stuck with rebooting my device as many times as it takes, to get it working.
Did not happen on Windows 10. That is my first try installing Linux on this notebook.
I presume that my touchpad device is a SynPS/2 Synaptics TouchPad (Terminal: xinput).
Any advice on what I can do or check to get rid of this problem?