Please try these, in any order:
1. Replacing the batteries in your wireless mouse.
2. A wired mouse.
3. sudo apt remove xserver-xorg-input-synaptics
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Package changed: xorg-server (Ubuntu) => ubuntu
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https://bugs.launchpad.net/bugs/1887001
Title:
Mouse suddenly stopped working
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