Thanks. It looks like the problem is indeed coming from the hardware, or
the kernel:

Event: time 1572507471.026025, -------------- SYN_REPORT ------------
Event: time 1572507471.042024, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1572507471.042024, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1572507471.042024, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90002
Event: time 1572507471.042024, type 1 (EV_KEY), code 273 (BTN_RIGHT), value 1
Event: time 1572507471.042024, -------------- SYN_REPORT ------------
Event: time 1572507471.066028, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90002
Event: time 1572507471.066028, type 1 (EV_KEY), code 273 (BTN_RIGHT), value 0
Event: time 1572507471.066028, -------------- SYN_REPORT ------------
Event: time 1572507471.122029, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1572507471.122029, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1572507471.122029, -------------- SYN_REPORT ------------

At time '1572507471.042024' you got both the left and right buttons
going down in precisely the same microsecond. Then only a few
milliseconds later the right button was released. Much later (a tenth of
a second) the left button was released. So yeah it looks like only the
left button was a real click from a human :)

It looks like a faulty mouse, sorry. Maybe the buttons get physically
stuck together sometimes and can just be cleaned out somehow?

** Package changed: gnome-shell (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1850627

Title:
  Right click happens automatically, disturbs work

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