How to install alfa net w113 usb wifi adapter in linux 18.04 [duplicate]

You can install rtl8188fu driver with dkms via this repo (has install instruction).

@Butterly's answer worked for me. But I will write out the steps here to make it clearer for others (copy/pasted from https://github.com/kelebek333/rtl8188fu):

For Kernel 4.15 ~ 4.20 (Linux Mint or Ubuntu Derivatives)

sudo apt-get install build-essential git dkms linux-headers-$(uname -r)

git clone https://github.com/kelebek333/rtl8188fu

sudo dkms add ./rtl8188fu

sudo dkms build rtl8188fu/1.0

sudo dkms install rtl8188fu/1.0

sudo cp ./rtl8188fu/firmware/rtl8188fufw.bin /lib/firmware/rtlwifi/

After you are done, reinsert the wifi dongle and if you ifconfig, you should now have a new device present.

Finally! We do have a native Linux driver for 0bda:f179 RTL8189FTV! The only thing is that it needs some expertise to use (and Internet).

The driver is not mainline, so Ubuntu and derivatives do not have it.

The driver is here. Its called rtl8188fu.

Download the entire repository as zip. Then, in the Makefile, add -Wno-error=date-time as an EXTRA_CFLAGS. Basically, add the line:

EXTRA_CFLAGS += -Wno-error=date-time

Then, compile with make. After successful compile, you will get: 8188fu.ko then (as root) do:

insmod ./8188fu.ko

That's it. It will work now. I have compiled it for 16.04 LTS (4.4.0-138-generic), so the compatibility of the driver is pretty good.

The situation regarding 18.04 is slightly complicated, as the driver hasn't been updated for over an year.
I have made changes to the driver to work with 18.04 4.15.0-38 kernel, and it works.

Output of uname -a:

Linux theoraxpc01-Veriton-Series 4.15.0-38-generic #41-Ubuntu SMP Wed Oct 10 10:59:38 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Output of usb-devices (on 18.04):

T:  Bus=02 Lev=02 Prnt=02 Port=03 Cnt=01 Dev#=  3 Spd=480 MxCh= 0     
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1     
P:  Vendor=0bda ProdID=f179 Rev=00.00     
S:  Manufacturer=Realtek     
S:  Product=802.11n          
S:  SerialNumber=00E0252CB0BF
C:  #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA     
I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=rtl8188fu   

I have uploaded both the module and the fixed drivers on my Google Drive. The module will work for 4.15.0-38-generic and this is the kernel against which I have compiled the source.