Linksys AE2500 is wireless adaptor of some sort? I believe that 15.04 used kernel 3.19, 15.10 is on kernel 4.2. If you reboot the computer, hit esc after the bios, you should be in the Grub menu. scroll down to Advanced options, hit enter, that should bring up a list of kernels installed. If 3.19 is still there, select that and boot it. See if the adaptor works again.
That is a "datapoint" not a solution. It's been a while since I've done that (used ndiswrapper) but something just may need to be rebuilt for kernel 4.2.
32bit or 64bit version of the OS? That may also make a difference
This looks like it has a lot of good information. One thing that jumps out is the new kernel may be loading a module for the hardware that is preventing ndiswrapper from claiming it.
Edited by mremski, 09 January 2016 - 08:57 AM.