Hi all - this thread has been incredible valuable, thank you to the contributors and question askers. However, after working on this for several hours I'm still unresolved.
I'm attempting to install a Rosewell RNX-N150NUB wifi dongle purchased from Amazon (claiming to be Raspberry Pi compatible). I'm working with a Raspberry Pi 2 Model B 1GB. I actually have 10 of these, I'm setting these up for a club.
~ $ uname -a
Linux raspberrypi 3.18.11-v7+ #781 SMP PREEMPT Tue Apr 21 18:07:59 BST 2015 armv7l GNU/Linux
~ $ lsusb
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 0bda:ffef Realtek Semiconductor Corp.
I tried the following build:
3.18.11-v7+ #780, #781 - 8188eu-v7-20150406.tar.gz
... as follows:
tar xzf 8188eu-v7-20150406.tar.gz
Which didn't work, here meaning I can't see wlan0 when I "ifconfig".
I erased the 8188eu.ko driver installed by the above from /lib/modules/3.18.11-v7+/kernel/drivers/net/wireless/ and then tried:
sudo wget http://www.fars-robotics.net/install-wifi
sudo chmod +x /usr/bin/install-wifi
... and used the sudo install-wifi 8188eu
I don't receive any error messages in either of the two installation cases above, and further:
sudo insmod /lib/modules/3.18.11-v7+/kernel/drivers/net/wireless/8188eu.ko
sudo depmod -a
... does not produce an errors.
However, when I ifconfig I can not see wlan0, but if I plug in an old Cisco wifi dongle that I used on an old Windows laptop, the I everything works just fine (i.e. shows wlan0 when I ifconfig and connects to my wifi network).
I note my lsusb ID (ID 0bda:ffef Realtek Semiconductor Corp.) differs from those posted within this thread. The Rosewell RNX-N150NUB dongle did come with drivers, including the 8188eu.ko, but using it as provided produces an "Invalid Module Format" when attempting insmod.
Any thoughts on how I might be able to move this forward?
Thank you in advance.