Re: can't get wireless adapter to connect to router
A 10.42.0.xx IP address is typical of an ad-hoc computer-to-computer connection sharing arrangement. It is usually the result of filling in settings by clicking the Network Manager icon and selecting 'Create New Wireless Network...' Is that what you did? Is your wireless set to Infrastructure or Ad Hoc? Please see attached. Disregard the MTU setting.
I suggest you set to Infrastructure, wipe out all settings and let Network Manager discover your router and connect all by itself.
"Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.