Today i reinstalled my Ubuntu 11.04 on my Acer Aspire L-3600, because i failed to activate my wifi connection last week. Now, i'm writing this message using cable connection. But, my wifi still fail. Please help me to overcome this. Here are my data :

iwconfig :

lo no wireless extensions.
eth0 no wireless extensions.

ifconfig -a :

eth0 Link encap:Ethernet HWaddr 00:1c:25:2e:44:68
inet addr:192.168.1.103 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::21c:25ff:fe2e:4468/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14590 errors:0 dropped:0 overruns:0 frame:0
TX packets:11774 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:18394890 (18.3 MB) TX bytes:1281012 (1.2 MB)
Interrupt:18 Memory:feae0000-feb00000

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:16436 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:960 (960.0 B) TX bytes:960 (960.0 B)

sudo lshw -C network :

*-network UNCLAIMED
description: Network controller
product: BCM4311 802.11b/g WLAN
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:fe9fc000-fe9fffff
*-network
description: Ethernet interface
product: 82573L Gigabit Ethernet Controller
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 00
serial: 00:1c:25:2e:44:68
size: 100Mbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.2.20-k2 duplex=full firmware=0.5-7 ip=192.168.1.103 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:43 memory:feae0000-feafffff ioport:ec00(size=32)

Then, i also do as suggested in the 'sticky thread' : System > Administration > Synaptic Package Manager > Search: firmware-b43-lpphy-installer > Click Mark > Click install > Close.
Also failed.

Before that, i've tried < http://www.broadcom.com/products/Wir...utions/BCM4311 > as suggested in the network supported hardware list, download the file but then stopped cause i didn't know what to do . . .

I know i have the wifi device, i don't have the correct driver ... but, i don't know how to . . .
Please somebody give me any hints . . .


thanks . . .