I had the same problem as XTien above, i.e. random pasting when using text editors. Also tab windows would open randomly when scrolling ebay lists. This was with Ubuntu 18 LTS, Thinkpad E480 and Acer wired mouse. Tried re-installing Ubuntu, different text editor (sublime & atom) and finally worked out it was being caused by the mouse; changed mouse and everything seems to be okay.
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