User solution that works:
Edit the file /usr/share/themes/Lubuntu-default/gtk-3.0/settings.ini,
and change the value
from:
ntooltip_bg_color:#000000
to: ntooltip_bg_color:#C0C0C0
User solution that works:
Edit the file /usr/share/ themes/ Lubuntu- default/ gtk-3.0/ settings. ini,
and change the value
from:
ntooltip_ bg_color: #000000
to: ntooltip_ bg_color: #C0C0C0