Sorry, I'm not the author of this plug-in. I've just managed it to work. I didn't change its code 'cause I'm pretty dumb in coding. ry to contact the author. The newer betterlock version does...

+ Works well... but takes up a fair bit of space (a bit less panel space would be better... maybe combine to a single square showing combinations of number/letters).

Пожалуйста! Here you are!

Работает четко на Mint 17.3 x 64. СПАСИБО ! Works well on Mint 17.3 x 64. THANK you !