How to troubleshoot Wireless network issues in Ubuntu Linux on your Dell PC

Summary: This article takes you through wireless troubleshooting on a Dell PC that is using the Ubuntu Operating System.

Article Content


Symptoms

The following article provides information about how to identify and resolve a wireless network issue on your Dell PC with Ubuntu Linux installed.


Table of Contents:

  1. Troubleshooting a Wireless Network Issue
  2. Identifying any issues outside the system
  3. Troubleshooting the Hardware
  4. Troubleshooting the Software
  5. Resolution

 

Troubleshooting a Wireless Network Issue

 

This troubleshooting guide can help you resolve wireless network (Wi-Fi) issues for systems with the Ubuntu Linux Operating System (OS).

If your system has a Windows OS installed, refer to the article:


Back to Top

 


Resolution

 

Identifying any issues outside the system

 

  1. Can your system detect local Wi-Fi networks, but it cannot connect to them?

    1. If it can see networks and connect to any other network but yours, contact your Internet Service Provider ISP. The network itself or your connection settings may be at fault.

    2. If it can see networks but cannot connect to any, and your Wi-Fi strength is low, proceed with step 2.

    3. If it cannot see any networks even when physically held over the router, proceed with step 2.

    4. If it can intermittently see and connect to available wireless networks, proceed to section 3, step 1.

    5. If it does not detect your installed Wi-Fi card, proceed to step 3.

  2. Can other devices connect to the Wi-Fi?

    1. If they can, carry on with the guide.

    2. If not, contact your ISP about a general network issue.

  3. If you boot the system to the Basic Input Output Setup (BIOS), can you see the installed Wi-Fi card?

    1. If it is detected, then proceed with the guide.

    2. If it is not detected, proceed to section 3 step 1.

SLN151759_en_US__1icon Note: Press the <F2> key at the Dell splash screen and navigate to the onboard devices.

SLN151759_en_US__21376660682124.dellsplash

  1. In the BIOS check that the wireless is enabled and disable the Wi-Fi switch if your system has one installed. Boot back to the OS and confirm if the issue continues?

    1. It does, proceed with the guide.

    2. It does not, go back into the bios and reenable the Wi-Fi switch. If the fault comes back contact your Technical Support to resolve this issue. If the fault does not come back, your issue should be resolved.

    3. It does not have a switch, proceed to the next step.


Back to Top


 

Troubleshooting the Hardware

 

  1. Boot from the Ubuntu Linux Media, either a CD or a USB and advise if the issue occurs while in that OS?

    1. If it works fine, you are looking at a clean install and driver reinstall.

    2. If it is the same, please proceed with this guide.

SLN151759_en_US__1icon Note: Press the F12 key at the Dell splash screen and select either CD or USB boot from the options menu that appears. Then select Try Ubuntu to boot from the media, instead of your Hard Drive.

SLN151759_en_US__41376660568438.BootMenu

  1. The best way to rule out a hardware issue is to two-way swap the Wi-Fi card with another compatible system.

    1. You could swap out the Wi-Fi card and:

      1. The fault followed the original card to the working system, and the card from the working system works in your machine. Contact your technical support to have the hardware issue resolved.

      2. The fault stays with the working card in your system and your card is working fine in the working machine. Continue with this guide.

      3. The fault goes away on both machines. It was a loose connection and your issue should be resolved.

    2. If that is not possible, then reseat the Wi-Fi card and antenna cables:

      1. If the situation changes and the Wi-Fi starts to work, it was a loose connection and your issue should be resolved.

      2. If your issue continues, please proceed with the next step.

SLN151759_en_US__1icon Note: You can find your system manual on our support site as long you have your tag or model type.


Back to Top


 

Troubleshooting the Software

 

SLN151759_en_US__1icon Note: Disconnect any wired network media while going through these troubleshooting steps.
 
  1. Run the following troubleshooting steps on the wireless adapter:

    1. Open Terminal (CTRL+Alt+T)

    2. Get the details from the adapter using the following command:

      sudo nm-tool

      Check if the output contains State: connected. If it does, the card is connecting.

    3. If not, you can get more details from the adapter using the following commands:

      sudo lshw -businfo
      sudo lshw -c network

    4. You should get a result that looks something like this:

      product: Intel8720A Wireless Network Adapter

    5. Run the following commands:

      /etc/pm/config.d/config;

      And

      SUSPEND_MODULES="<adapter model>"

    6. Enter the following command:

      echo "options <adapter model> fwips=N" | sudo tee /etc/modprobe.d/rtl8723be.conf

    7. Reboot the system and check if the issue occurs again?

      1. Yes, the issue is resolved and everything is working fine now.

      2. No, the issue continues and is intermittent. Contact technical support to troubleshoot this further.

      3. No, the issue continues and is constant. Proceed to the next step.

  2. Scan for networks using NetworkManager. Click the NetworkManager on your menu bar.

SLN151759_en_US__7Network_dropdown_bk

  1. The dropdown menu will show a list of wireless networks in range. Select from the list to connect.

    1. It shows the available networks but will not connect to any. Proceed with the next step.

    2. It does not see any networks. Contact your Technical support to resolve this issue.

SLN151759_en_US__8No_wireless_Network_BK

  1. Scanning from the command line is another option. Click Dash Home > Search > Terminal. The Terminal program will launch.

  2. Enter the following command in terminal:

    sudo iwconfig

SLN151759_en_US__91376660410160_ubuntu-9_10-terminal_bk

  1. The system will display a list of network adapters:

    eth0

    No wireless extensions

    lo

    No wireless extensions

    wlan0

    IEEE 802.11bgn ESSID:off/any mode: Managed Access Point: Not-Associated Tx-Power: 16dBm Sensitivity=0/3 Retry long limit: 7 RTS thr: off Fragment thr: off Power Management: off

    wlan0

    Is the wireless adapter entry

  2. Enter the following command in terminal: (Where <ethX> is the name of the wireless adapter as found in the last command.)

    sudo iwlist <ethX> scan

  3. The system will scan for access points and return a list of the ones it has found. The output from the scan will contain some useful information. Look for these pieces of information that might help your troubleshooting.

    ESSID

    This is the wireless network name, SSID

    Mode

    This is the wireless network access mode, Managed=Access Point Mode

    Quality

    This number indicates the signal quality, from 1 - 5

    Encryption key

    This indicates if this network requires an encryption key.

  4. Enter the following command in terminal: (Where -c 4 means 4 echo requests and 127.0.01 is the loopback address.)

    sudo ping -c 4 127.0.0.1

    If the loopback does not work, then it could be an issue with the TCP/IP stack.

    You can also ping your router's IP address, an external site using either its IP address, or common name. If it connects to an address, but not a common name then it could be a DNS issue


Back to Top


 

Resolution

 

  1. Do the results point to a hardware or software issue?

    1. If the Hardware is faulty contact your Technical Support with the troubleshooting you have done, to get the issue resolved.

    2. If the hardware is verified to be working, but your issue persists? The next step would be to get in touch with Canonical the suppliers of Ubuntu Linux and the built-in drivers. They can take you through in-depth software and driver troubleshooting to resolve your issue. You can find all of their information about the Ubuntu Community Support SLN151759_en_US__10iC_External_Link_BD_v1 page. As well as a community support group that will also attempt to resolve any issues that remain.

If at any point what you see differs from what is described, please contact your technical support for further aid to resolve the problem.


Back to Top


 

Additional Information:

 

SLN151759_en_US__1icon Note:
Software support is by Canonical through the following methods:
Technical Support is provided by Dell:


Back to Top


Article Properties


Affected Product

Inspiron, Latitude, Vostro, XPS, Fixed Workstations

Last Published Date

21 Feb 2021

Version

4

Article Type

Solution

Rate This Article


Accurate
Useful
Easy to Understand
Was this article helpful?

0/3000 characters