Comment 3 for bug 1852624

This issue has been resolved by KiCad 5.1. If your distribution does not provide this, you will need to either download from another source or use a distribution that is officially supported.

Note that Mint is not officially supported and the Mint project does not maintain a KiCad release and there are some issues using Ubuntu packages. However, we provide some best-effort guidelines here: http://kicad-pcb.org/download/linux-mint/

Please report issues upstream to Linux Mint for this issue.