The command iw dev does not show the wifi dongle, neither does rfkill list but iwconfig does :
$ iw dev
$ echo $?
0
$ rfkill list all
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
$ iwconfig 2>/dev/null
wlx0 unassociated Nickname:"rtl_wifi"
Mode:Managed Access Point: Not-Associated Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
If iwconfig can "see" the Wi-Fi dongle, I assume there no need to rebuild the r8712u driver.
Here is some more information about this dongle :
$ lsusb -s 1:19
Bus 001 Device 019: ID 06f8:e031 Guillemot Corp. Hercules HWNUm-300 Wireless N mini [Realtek RTL8191SU]
$ lsusb -t | grep Dev.19
|__ Port 1: Dev 19, If 0, Class=Vendor Specific Class, Driver=r8712u, 480M
$ inxi -Nxx
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK P8P67 and other motherboards
driver: r8169 v: 2.3LK-NAPI port: e800 bus ID: 03:00.0 chip ID: 10ec:8168
Device-2: Guillemot Hercules HWNUm-300 Wireless N mini [Realtek RTL8191SU] type: USB driver: r8712u bus ID: 1-1:19
chip ID: 06f8:e031
The wireless-tools and iw packages are already installed :
$ dpkg -l wireless-tools iw
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-========================-=================-=================-======================================================
ii iw 3.17-1 amd64 tool for configuring Linux wireless devices
ii wireless-tools 30~pre9-8ubuntu1 amd64 Tools for manipulating Linux Wireless Extensions
I'm using Ubuntu 16.04.6 LTS by the way :-)
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