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I upgraded from 16.10 to 17.04 and although wifi is detected but it is unable to connect.

I tried to remove and reinstall drivers:

sudo apt-get purge bcmwl-kernel-source
sudo apt-get install linux-generic bcmwl-kernel-source

But still it doesn't work. WiFi adaptor: TP-Link WDN 4200

lsusb result:

Bus 002 Device 005: ID 0458:003a KYE Systems Corp. (Mouse Systems)
NetScroll+ Mini Traveler / Genius NetScroll 120
Bus 002 Device 004: ID 04f2:0736 Chicony Electronics Co., Ltd 
Bus 002 Device 003: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 148f:3573 Ralink Technology, Corp. RT3573 Wireless Adapter 
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

marked as duplicate by Sumeet Deshmukh, user364819, Eric Carvalho, Charles Green, Wild Man May 25 '17 at 3:55

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 1
    TP-Link WDN4200 has a Realtek chipset and what you purged/installed relates to Broadcom chipsets only. The first thing you need to understand is that solutions are hardware specific. – user589808 Apr 15 '17 at 21:35
  • Please edit your question to add the result of the terminal command: lsusb And also: lsmod | grep rtl – chili555 Apr 15 '17 at 21:39
3

There is a well-known bug in Network Manager in Ubuntu 17.04. Let's amend one file and try to fix it. Please open a terminal and do:

gksudo gedit /etc/NetworkManager/NetworkManager.conf

Use nano or kate or leafpad if you don't have the text editor gedit. Add lines:

[device]
wifi.scan-rand-mac-address=0

Save and close file then reboot. Now are you able to connect?

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