OK, What's the output of this command in a terminal?
I don't remember that being a problem with input-wacom-0.13.0. Although there have been occasional build problems in specific instances that have been fixed so it would be interesting if that happens with 0.15.0 too.
I should add, it doesn't only bring up the kernel issue on the compiling, I found one of the PPA's he lists and tried it and it came up with a similar error at the end.
linux kernel - yes
kernel source - no
We could not find the kernel development environment to build the driver.
Please install the kernel source or the kernel development package and try again.
Is it complaining about build-essential not being installed? When you run the library/dependency line:
you're getting the whole thing and it isn't complaining or throwing errors?
sudo apt-get install build-essential libx11-dev libxi-dev x11proto-input-dev xserver-xorg-dev libxrandr-dev libncurses5-dev autoconf libtool
Another thought is with Update Manager open Settings on the bottom left. Is Source code checked in the Ubuntu software tab?