Today bought Wi-Fi USB adapter D-Link DWA-131. It does not worked "out of box". Tried solution from Install DWA-131 WiFi dongle driver under Ubuntu 14.04.4 – does not helped too.
Here is end of dmesg, hope it is significant:
[ 3548.951789] usb 1-5.2: new high-speed USB device number 7 using xhci_hcd
[ 3549.052123] usb 1-5.2: New USB device found, idVendor=2001, idProduct=3319
[ 3549.052133] usb 1-5.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3549.052138] usb 1-5.2: Product: Wireless N Nano USB Adapter
[ 3549.052144] usb 1-5.2: Manufacturer: Realtek
[ 3549.052148] usb 1-5.2: SerialNumber: 00e04c000001
[ 3549.053281] usb 1-5.2: This Realtek USB WiFi dongle (0x2001:0x3319) is untested!
[ 3549.053288] usb 1-5.2: Please report results to Jes.Sorensen@gmail.com
[ 3549.123642] usb 1-5.2: Vendor: Realtek
[ 3549.123646] usb 1-5.2: Product: Wireless N
[ 3549.123648] usb 1-5.2: Serial: no USB Adap
[ 3549.123651] usb 1-5.2: rtl8192eu_parse_efuse: dumping efuse (0x200 bytes):
[ 3549.123654] usb 1-5.2: 00: 29 81 00 7c 01 40 03 00
...
[ 3549.123784] usb 1-5.2: 1f8: ff ff ff ff ff ff ff ff
[ 3549.123788] usb 1-5.2: RTL8192EU rev B (SMIC) 2T2R, TX queues 3, WiFi=1, BT=0, GPS=0, HI PA=0
[ 3549.123792] usb 1-5.2: RTL8192EU MAC: 18:0f:76:09:dc:de
[ 3549.123795] usb 1-5.2: rtl8xxxu: Loading firmware rtlwifi/rtl8192eu_nic.bin
[ 3549.267433] usb 1-5.2: Firmware revision 19.0 (signature 0x92e1)
[ 3550.737563] rtl8xxxu 1-5.2:1.0 wlx180f7609dcde: renamed from wlan0
[ 3550.793700] IPv6: ADDRCONF(NETDEV_UP): wlx180f7609dcde: link is not ready
Will be very gratefull for any help on this trouble.
UPD: Here is diagnostic output requested by chili555:
$ lsmod | grep rtl
rtl8xxxu 122880 0
rtl8188ee 94208 0
rtl_pci 32768 1 rtl8188ee
rtlwifi 77824 2 rtl_pci,rtl8188ee
mac80211 778240 4 rtl_pci,rtl8188ee,rtlwifi,rtl8xxxu
cfg80211 622592 3 mac80211,8192eu,rtlwifi
$ dmesg | grep wlx
[11931.764451] rtl8xxxu 1-5.2:1.0 wlx180f7609dcde: renamed from wlan0
[11931.966937] IPv6: ADDRCONF(NETDEV_UP): wlx180f7609dcde: link is not ready
$ rfkill list all
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
4: phy4: Wireless LAN
Soft blocked: no
Hard blocked: no
Best Answer
You have several possibly conflicting drivers loaded. The driver rtl8xxxu should drive the USB well. Let's blacklist all others and see if the USB now works as expected. From the terminal:
Reboot and tell us if there is any improvement.