@DH, you can find partial workarounds in comment https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1562734/comments/15 and question https://answers.launchpad.net/onboard/+question/404618
That's all I know of currently, unfortunately. For anything better we need cooperation from unity-greeter and Gtk, neither of which has been forthcoming so far.
@DH, you can find partial workarounds in comment /bugs.launchpad .net/ubuntu/ +source/ unity-greeter/ +bug/1562734/ comments/ 15 /answers. launchpad. net/onboard/ +question/ 404618
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and question
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That's all I know of currently, unfortunately. For anything better we need cooperation from unity-greeter and Gtk, neither of which has been forthcoming so far.