DIR-655 is D-Link router not Linksys.  Under Firewall Settings/Advanced, check the DMZ button and input the IP of the machine running Ubooquity. If Ubooquity now works then you have configured port fowarding wrong. If it still doesn't work try disabling Windows Firewall.
Public IP is issued by your ISP which you have no control over (unless you purchase a static one). LAN IPs are assigned by your router in the range 192.0.0.0/10.0.0.0