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73416ba
(Get the code!)
Hi Po-Hsu
I spent this evening installing Ubuntu. I tried Xenial, Bionic, Focal and Groovy.
The proposed release worked on Xenial, but not on any of the others.
Just to confirm the process: I installed a fresh copy of the release, then went to the developer options tab in the Software and Updates app and ticked the proposed box. When this was done, the app updated the cache. Then I used Software updater to upgrade and it worked (or not). For the releases that didn't work I also tried using apt from the terminal. Updated and then upgraded. Rebooted and then tested for the trackpad function. Only worked in Xenial.
Let me know if I needed to do something different or to try again.
Regards,
Tom