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I just installed Ubuntu 15.10 on my dell latitude 3340 and now i cannot enable wifi since it is greyed out. Is there anyone who can help me with this? Any help is much appreciated!

PS here is a link with additional info about my wifi: http://paste.ubuntu.com/12999579/

dmesg | grep rename results in:

[    1.308743] e1000e 0000:00:19.0 eno1: renamed from eth0
[    2.600819] iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0
Pilot6
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ARTLAUROO
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  • Please execute the statement dmesg | grep rename and append the results of this to your question. I also had an issue with WiFi, and was able to resolve it, but it was not easy. – Charles Green Oct 29 '15 at 15:27
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    Possible duplicate of Wifi losing connection, weak signal, Intel 7260 adapter – Pilot6 Oct 29 '15 at 15:27
  • @Pilot6 I'm not sure this is a duplicate: for me, the same issue was the renaming of the wifi link that occurs during the boot processes. – Charles Green Oct 29 '15 at 15:29
  • The problems with this adapter can be solved the way it is answered to the other question. – Pilot6 Oct 29 '15 at 15:30
  • The result of dmesg | grep rename is: [ 1.308743] e1000e 0000:00:19.0 eno1: renamed from eth0 [ 2.600819] iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0 – ARTLAUROO Oct 29 '15 at 15:32
  • @user2351350 You could try the answer suggested by Pilot6, however this solution would not have worked for me (I am within 6 feet of the router; My signal strength is fine. I will post an answer to this question in a short bit, with instructions for the fix that worked on my system – Charles Green Oct 29 '15 at 15:35
  • @Pilot6 I just tried the commands in the answer proposed by you (and rebooted after trying each of them) but the problem still remains.. – ARTLAUROO Oct 29 '15 at 15:37
  • @CharlesGreen I also do not think my problem has to do with wifi strength, but with the fact my wifi adapter just does not work with ubuntu at the moment, maybe a driver issue or something? – ARTLAUROO Oct 29 '15 at 15:39
  • Working on the answer that helped for me... – Charles Green Oct 29 '15 at 15:43
  • about 2 minutes: I do want to check for typos. I assume this card worked properly in Ubuntu before 15.10? – Charles Green Oct 29 '15 at 15:45
  • @user2351350 Posted the answer - it's a fair bit of work, and will require two reboots. You adaptors name prior to the renaming process is wlan0 – Charles Green Oct 29 '15 at 15:53
  • @CharlesGreen This is the first ubuntu version i have installed on this device so i do not know if it works with other ubuntu versions.. But i'll try your answer and post the result here. Thanks for you effort – ARTLAUROO Oct 29 '15 at 16:16
  • Should it fail, delete the file in rules.d and reboot: rm 70-persistent-net.rules – Charles Green Oct 29 '15 at 16:18

1 Answers1

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In my Dell 5521, the problem is related to renaming of the wireless adapter at boot time.

To prevent adapter renaming, I use a kernel parameter net.ifnames=0

Open a terminal window (Ctrl+Alt+t), and enter:

sudo nano /etc/default/grub

Change the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash net.ifnames=0"

Press Ctrl+o and Ctrl+x to save and exit, then enter

sudo update-grub sudo reboot

Kevin Bowen
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Charles Green
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  • I tried the first part of your answer, but i get stuck at the point where i need to execute the command cat /sys/class/network/<wlan new name>/address because i get the error cat: /sys/class/network/wlp3s0/address: No such file or directory I checked and there is indeed no network folder with that address, any idea what the cause of this may be? – ARTLAUROO Oct 29 '15 at 16:26
  • Dang! it should have been /sys/class/net/wlp3s0/address : I knew I should have triple checked the syntax! – Charles Green Oct 29 '15 at 16:30
  • I did all the steps but there is still no change, the "enable wifi" setting is still greyed out.. Thanks for your help though! If you still have any ideas or a suggestion in what direction i can continue my search i would like to hear it :) – ARTLAUROO Oct 29 '15 at 16:47
  • Stupid me - I should have looked harder at your question. rfkill list which was in your pastebin, shows the wifi is turned off in the hardware (hard blocked: yes) - look for the switch on your keyboard, side of the computer, or in bios... you will probably need to reboot, baased upon some of the things I've read. – Charles Green Oct 29 '15 at 17:00
  • Your wireless is showing hard blocked:yes. What is the position of the wireless switch on your laptop? – chili555 Oct 29 '15 at 20:27
  • @CharlesGreen It was indeed a key i needed to press, thanks! I already saw a post which gave this answer, but it showed a picture of a laptop which had a dedicated button for that switch and mine does not have such a button. But you answer made me think that it could be a key on my keyboard and that was the solution, so thanks again for all your efforts! Is there a way i can give credits to your answer for karma or something? – ARTLAUROO Oct 30 '15 at 09:22
  • @user2351350 The last comment where I mentioned a key, you will find a small up-arrow next to it when you hover your mouse nearby - clicking on this gives me a small boost in reputation points. – Charles Green Oct 30 '15 at 13:40
  • @CharlesGreen Im pretty new to this forum but i think i do not have enough rep to upvote comments, is that possible? Because i can only delete comments as it seems, not upvote them.. – ARTLAUROO Oct 30 '15 at 14:52
  • Could be! I'm glad that you have solved your problem though, and wish I had read your original post more closely. – Charles Green Oct 30 '15 at 14:55