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I have just upgraded my Dell XPS L322X laptop from 16.04 to 18.04, and the behavior of my trackpad changed. Previously, I could drag to select text or move objects by clicking the left button of the pad and moving my finger. Now, I can only do so by tapping twice and moving. I do not know if tap-and-drag was working before.

I have looked at some configuration options available at xinput and at the Synaptics driver, but none of them seem to be related. In particular, disabling tap-and-drag does not make click-and-drag work.

This question reports a similar issue on 17.10: 17.10 upgrade: Drag & drop on touchpad doesn't work.

There is a possibly related bug report on Launchpad: https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1763209?comments=all.

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I was finally able to find a solution: installing the xserver-xorg-input-synaptics package made it all work; it even improved the sensibility of the trackpad.

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  • I needed to install xserver-xorg-input-all as well in order for my keyboard to work after this.
    – ltn100
    Apr 7, 2019 at 10:43

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