After installing the latest (proposed ?) kernel - 2.6.38-10-generic-pae
as part of the update process, I find that my wireless is now working:-

sudo lshw -C network>Desktop/wifi.txt; lsb_release -a>>Desktop/wifi.txt;
uname -a>>Desktop/wifi.txt; rfkill list >>Desktop/wifi.txt;cat
/etc/modprobe.d/blacklist-acer.conf>>Desktop/wifi.txt

 *-network
       description: Ethernet interface
       product: AR8151 v1.0 Gigabit Ethernet
       vendor: Atheros Communications
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth1
       version: c0
       serial: 20:6a:8a:3a:26:4b
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet 
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c 
driverversion=1.0.1.0-NAPI firmware=N/A latency=0 link=no multicast=yes 
port=twisted pair
       resources: irq:43 memory:d3400000-d343ffff ioport:2000(size=128)
  *-network
       description: Wireless interface
       product: BCM43225 802.11b/g/n
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth2
       version: 01
       serial: 90:00:4e:90:92:ac
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
       configuration: broadcast=yes driver=wl0 driverversion=5.100.82.38 
ip=192.168.0.112 latency=0 multicast=yes wireless=IEEE 802.11bgn
       resources: irq:17 memory:d2400000-d2403fff
Distributor ID: Ubuntu
Description:    Ubuntu 11.04
Release:        11.04
Codename:       natty
Linux richard-1830T 2.6.38-10-generic-pae #46-Ubuntu SMP Tue Jun 28 16:54:49 
UTC 2011 i686 i686 i386 GNU/Linux
0: brcmwl-0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
blacklist acer_wmi

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https://bugs.launchpad.net/bugs/778168

Title:
  WiFi does not function on Acer 1830T with 11.04

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