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I just install or try the Ubuntu 18.04 desktop amd64 on my Acer Inspire S3 . When I use the (in ms windows = file manager) to copy files, ubuntu18.04 does not recognise my laptop touchpad's Right or Left buttons.

Does not show up the [copy/paste/move/...] menu after pressing the touchpad Right button. There is no way to copy and paste files.

I have to use Ubuntu 16.04 and it works perfectly or I have to plug an external USB mouse and it also works fine.

I think the ubuntu18.04 desktop amd64 touchpad driver does not support Acer S3 Laptop.

Please give me suggestions to resolve this issue.

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It is not driver issue but default touchpad settings. Go to Mouse and Touchpad in Settings. Increase touchpad speed and disable Natural scrolling.

You need to install gnome-tweaks.

sudo apt install gnome-tweaks

You can change default behavior. You need to change settings from Keyboard & mouse >> Mouse Click Emulations >> Area

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