Worked for me as well, thank you!
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https://bugs.launchpad.net/bugs/1902154
Title:
Touchpad Not Detected
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Public bug reported:
I installed Ubuntu on my new laptop, but the touchpad isn't working so I
have to use a USB mouse.
The laptop is a Lenovo IdeaPad 3 15"
The model number is 81WE011UUS
I followed the instructions here but did not see any touchpad related devices
listed