I have a dual boot setup with Windows 7 and Ubuntu 14.04. Everything was working fine until yesterday morning after login I couldn't get the wifi in ubuntu stopped to work (see details below) the windows part seems to work just fine. I would like to restore the wifi in ubuntu.
The last time everything was fine, I was trying to (unsuccessfully) install haskell-platform in ubuntu (see here ). I followed the advice here and downgraded my libgl1-mesa-glx package. As a result some brutal changes took place and I had to reinstall Xorg and Desktop-Environment. The problem with network manager started after that so I am guessing this was the source.
As mentioned before, I can access wifi via Windows. I can also access wifi by using a live ubuntu-usb. So, I can install packages to my hdd-ubuntu distribution. This makes me believe that there is no hardware problem and somehow I have deleted some essential packages.
I am a noob in networking issues so most of what I have done (outlined below) is based on my very limited (and perhaps wacky) understanding and reading through many threads on this site and elsewhere. So it is entirely possible that I have missed something trivial.
I purged and then reinstalled the packages network-manager, resolvconf; isc-dhcp-client and isc-dhcp-server packages couple of times.
This doesn't seem to solve the problem.
My ifconfig -a reads:
eth0 Link encap:Ethernet HWaddr 78:45:c4:b6:b4:85
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:17
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:27488 errors:0 dropped:0 overruns:0 frame:0
TX packets:27488 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2028140 (2.0 MB) TX bytes:2028140 (2.0 MB)
virbr0 Link encap:Ethernet HWaddr 3e:e3:92:b9:ab:c6
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0 Link encap:Ethernet HWaddr 08:3e:8e:04:2f:9f
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lshw -C shows
*-network
description: Wireless interface
product: AR9485 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:07:00.0
logical name: wlan0
version: 01
serial: 08:3e:8e:04:2f:9f
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.13.0-77-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:19 memory:f7d00000-f7d7ffff memory:f7d80000-f7d8ffff
*-network
description: Ethernet interface
product: AR8162 Fast Ethernet
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 10
serial: 78:45:c4:b6:b4:85
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx latency=0 link=no multicast=yes port=twisted pair
resources: irq:47 memory:f7c00000-f7c3ffff ioport:e000(size=128)
Some other configuration files that I checked were :/etc/network/interfaces which reads
auto lo
iface lo inet loopback
I added and then commented out #auto eth0, #iface eth0 inet dhcp, #auto wlan0, #iface wlan0 inet dhcp because it didn't solve the problem and just started the message waiting for network configuration when booting into ubuntu.
My /etc/resolv.conf reads
#Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
nameserver 8.8.8.8
My /etc/hosts reads
127.0.0.1 localhost
127.0.1.1 my-comp
#The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
and my /etc/NetworkManager/NetworkManager.conf reads
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
My iwconfig outputs:
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
If tried `sudo ifdown wlan0' and 'sudo ifup wlan0' and didn't get any output which makes me think they are ok.
I am looking for any directions that I might take to solve the problem. One possible way out, I think, is to try to transfer all relevant packages from live-usb to my home folder but I am not sure how to go about it.... I would prefer any solution short of a fresh install at this point.
Thank you for your help in advance (and special thanks for any impromptu networking lessons too). I would be happy to put any additional information.
Some additional info based on answers/comments.
rfkill list output
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
A million thanks to this question here the problem is a bug in libnl package (see here for details ).
I do not claim any credit for this answer. I am posting it because I myself wasn't aware of this issue (and erroneously thought that the reason was something else) so people doing google search on wifi issues on ubuntu maynot get directed to that question but they might benefit from the solution .
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments