Here's a link to a pretty good site to wireless driver information. This ain't gonna be simple. Note this is for rev_A2.
http://www.wikidevi.com/wiki/D-Link_DWA-525_rev_A2
If you want to develop knowledge, you can work to get your internal card working. If you just want your wireless to work, you might consider a nano USB adapter that is known to work. I'm using one of these on a Thinkpad with a built-in G speed Wifi:
http://www.amazon.com/gp/product/B00...pf_rd_i=507846
with the realtek driver. The driver that comes integral with Ubuntu recognizes the adapter but will not connect. The driver from Realtek includes an install script that seems quite reliable, you just have to know how to run a bash script.
Upon further research, you might have another alternative. I looked at Dlink's drivers. There are Windows drivers that include .cat .inf & .sys files in the drivers folder. You could download these and try using NDISwrapper. The software center should have it and the GUI front-end. If you're using 32 bit Ubuntu you'd need 32 bit WindowsXP/2K drivers, Ubuntu64 needs 64 bit WinXP drivers. Win Vista/Win7 drivers generally don't work. You're fortunate that Dlink uses this driver style; many vendors just give an .exe file which will not work with NDIS wrapper. I'm not a fan of NDISwapper; if it doesn't work I've had it mess up an install big-time but at least Dlink has the correct Windows driver format to be able to use it.
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