I could not install the firmware-rtlwifi.tcz extension: Not found. Instead I found and installed firmware-ralinkwifi.tcz, but it did not solve the problem. I looked in /lib/firmware and I saw it installed rt2xxx.bin and rt3xxx.bin files, but not a rt8188 or 8192.
dmesg gives:
....
[ 3.013161] usb 1-1.2: new high-speed USB device number 4 using dwc_otg
[ 3.115303] usb 1-1.2: New USB device found, idVendor=0bda, idProduct=8176
[ 3.115335] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3.115350] usb 1-1.2: Product: 802.11n WLAN Adapter
[ 3.115363] usb 1-1.2: Manufacturer: Realtek
[ 3.115376] usb 1-1.2: SerialNumber: 00e04c000001
....
[ 26.863010] usbcore: registered new interface driver rtl8192cu
....
Nothing more about wifi.