View Full Version : [SOLVED] No ethernet nor wireless with 11.04

July 13th, 2011, 10:21 PM
i'm a beginner with ubuntu and i installed 11.04 yesterday (so not yet familiar with the new desktop configuration). Also, I have the french version so i'll do my best to translate the terms in english...

I have a major problem: i can't connect to internet by ethernet cable or by wireless. The network icon is always empty. It doesn't detect the ethernet cable and the wireless networks around. I've tried different things i found on forums. I'v reinstalled the b43 package and rebooted. At the beginning i was only having problem with the wireless; i could connect via ethernet. But on one forum, a dude suggested the command

unity --replace
compiz --replace
and it made my computer bug i had to force shutdown. When i restarted, ethernet cable was no longer detected.......

My PCI card is a Broadcom BCM4311.

Here is what i get when i type some commands in terminal (notice the (...) means there is other stuff written but since i'm on another computer i can't copy-paste it so i just wrote the big lines):


lo no wireless extensions.

sudo lshw -C network:

*-network UNCLAIMED
description: Network controller

*-network UNCLAIMED
description: Ethernet controller

lspci|grep -i ether:

03:00.0 Ethernet controller`Broadcom Corporation BCM4311-B0 100Base-TX (rev 02)


NetworkManager Tool

State: disconnected

sudo iwlist scan:

lo Interface doesn't support scanning.


lo Link encap: Boucle locale
inet adr: Masque...
Octets recus: 960 (960.0 B) Octets transmis:960 (960.0 B)

rfkill list all:

0: dell-wifi: Wireless LAN
Soft block: no
Hard block: no

hope i can get some ,help it's driving me crazy :(

July 13th, 2011, 11:40 PM
Just for a check could you please create a new user and see if the cable internet has started working again. If it does I would suggest you to keep with this user and delete the old user, but please do add new user to all groups original user belonged to. (I m suggesting u to keep new user and remove only because you recently installed ubuntu, so its a good idea to have a new user if internet works with it).
I am reminding you again not to delete old user before adding new user to all the groups old user belonged to. Google it to learn how to add new user to a pre-existing group and all. This compiz and unity thing together is a pain, man. Seriously.

July 14th, 2011, 11:32 PM
thanks a lot for the reply!!! unfortunaltely, it didn't work..

i decided to reinstall 11.04. Now ethernet is back, but wireless is still a problem. i've checked other threads, but seems like nobody got the same message than me when i type

sudo lshw -C network:

genevieve@genevieve-Vostro-1500:~$ sudo lshw -C network
[sudo] password for genevieve:
description: Network controller
product: BCM4311 802.11b/g WLAN
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:0c:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=b43-pci-bridge latency=0
resources: irq:17 memory:fe8fc000-fe8fffff
description: Ethernet interface
product: BCM4401-B0 100Base-TX
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 02
serial: 00:1c:23:86:fb:10
size: 100Mbit/s
capacity: 100Mbit/s
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=b44 driverversion=2.0 duplex=full ip= latency=64 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:17 memory:fe5fe000-fe5fffff


genevieve@genevieve-Vostro-1500:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.


eth0 Link encap:Ethernet HWaddr 00:1c:23:86:fb:10
inet adr: Bcast: Masque:
adr inet6: fe80::21c:23ff:fe86:fb10/64 Scope:Lien
Packets reçus:1688 erreurs:0 :0 overruns:0 frame:0
TX packets:1380 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:1898485 (1.8 MB) Octets transmis:301817 (301.8 KB)

lo Link encap:Boucle locale
inet adr: Masque:
adr inet6: ::1/128 Scope:Hôte
Packets reçus:12 erreurs:0 :0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:720 (720.0 B) Octets transmis:720 (720.0 B)

i've tried to install these packages (suggested by another thread) :


but it made my ethernet connection disappear. i completely suppressed the packages and ethernet is back again...

July 14th, 2011, 11:45 PM
Problem solved!!!

i found the solution there: