Follow the steps below to disable mouse middle or wheel click button:

From Terminal run xinput to discover the mouse device name

xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Microsoft Microsoft® Classic IntelliMouse®        id=10   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Power Button                              id=7    [slave  keyboard (3)]
    ↳ Belkin Corporation Flip CC                id=8    [slave  keyboard (3)]
    ↳ LITE-ON Technology USB NetVista Full Width Keyboard.

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This cure is applicable to Linux based systems such as Kubuntu and Ubuntu.

Stop those annoying pop-ups intruding into your workspace by simply running Spotify Music player in a second desktop window and leave it maximised as follows:

1. Go to System Settings/Workspace Behaviour/Virtual desktops and increase the number of desktops to 2
2. Activate second desktop by typing Ctrl-F2
3. Launch Spotify and select the music you like to play
4. Switch back to main desktop by typing Ctrl-F1 or select desktop from System Tray icon and continue working!

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