im out of ideas ...
for sure those two IPs shouldnt be the same .. Windows and Ubuntu VM being 192.168.1.70
i have zero knowledge on ubuntu commands .. can you set the IP of Ubuntu VM to static ?
IP 192.168.1.100 (if you dont have anything else configured on that address)
gateway 192.168.1.254
and try to connect with browser with the new static http://<ip>:1880
Select Network in the Ubuntu Settings menu and make sure that you have it set for wireless. As @UnborN says, the Ubuntu IP should NOT be the same as the PC.