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I managed to get ROS up and running on Ubuntu / Linaro 14.04, and get stable wifi. http://linuxcake.com/rpi2-ubuntu/ https://www.raspberrypi.org/forums/viewtopic.php?f=56&t=98997
This was helpful for the wifi - https://wiki.debian.org/WiFi/HowToUse#Wicd ^ tried the same procedure to get wifi with Ubuntu trusty 14.04 and it still doesn't work... no idea why.
Ran into some problems with memory when i plugged a Hokuyo LiDAR in to the pi running Ubuntu Linaro though, it completely crashed. Was able to temporarily fix it by changing the memory limit with "sudo ulimit -a" etc etc, but this is temporary and only for that terminal instance. You can change the config files to make it permanent but i can't get it to work.
If you can get snappy core 14 point whatever that might work? not looked into it massively but the wifi set up process is a bit different and might actually work. (I'm assuming that like me you tried Ubuntu Mate because the Wifi actually without you having a PhD in networking with linux?)
Hope this is of some use to someone, i think i'm going to give up and wait until some progress is made with trusty 14.04 or someone rolls out a better one. I have some single board X64 computers that'l run full desktop ubuntu so it's not a massive drama for me. I just wanted ROS running on the Pi so i had an excuse to play with the kernel and get a Pi TFT running on a robot of some nature.
Good luck guys!
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