The following fixed it for me:

sudo bzr diff -r149
=== modified file '.etckeeper'
--- .etckeeper  2012-06-03 11:23:33 +0000
+++ .etckeeper  2012-06-03 12:23:50 +0000
@@ -1830,8 +1830,6 @@
 maybe chmod 0755 './modprobe.d'
 maybe chmod 0644 './modprobe.d/alsa-base.conf'
 maybe chmod 0644 './modprobe.d/blacklist-ath_pci.conf'
-maybe chmod 0644 './modprobe.d/blacklist-bcm43.conf'
-maybe chmod 0644 './modprobe.d/blacklist-bcma.conf'
 maybe chmod 0644 './modprobe.d/blacklist-cups-usblp.conf'
 maybe chmod 0644 './modprobe.d/blacklist-firewire.conf'
 maybe chmod 0644 './modprobe.d/blacklist-framebuffer.conf'
@@ -1845,6 +1843,7 @@
 maybe chmod 0644 './modprobe.d/thinkfan.conf'
 maybe chmod 0644 './modprobe.d/vmwgfx-fbdev.conf'
 maybe chmod 0644 './modules'
+maybe chmod 0644 './modules~'
 maybe chmod 0755 './mono'
 maybe chmod 0755 './mono/2.0'
 maybe chmod 0755 './mono/2.0/Browsers'

=== removed file 'modprobe.d/blacklist-bcm43.conf'
--- modprobe.d/blacklist-bcm43.conf     2012-06-02 22:53:43 +0000
+++ modprobe.d/blacklist-bcm43.conf     1970-01-01 00:00:00 +0000
@@ -1,9 +0,0 @@
-# Warning: This file is autogenerated by bcmwl. All changes to this file will 
be lost.
-blacklist b43
-blacklist b43legacy
-blacklist ssb
-blacklist bcm43xx
-blacklist brcm80211
-blacklist brcmfmac
-blacklist brcmsmac
-blacklist bcma

=== removed file 'modprobe.d/blacklist-bcma.conf'
--- modprobe.d/blacklist-bcma.conf      2012-06-02 23:07:52 +0000
+++ modprobe.d/blacklist-bcma.conf      1970-01-01 00:00:00 +0000
@@ -1,1 +0,0 @@
-blacklist brcmsmac

=== modified file 'modprobe.d/blacklist.conf'
--- modprobe.d/blacklist.conf   2012-06-03 12:04:55 +0000
+++ modprobe.d/blacklist.conf   2012-06-03 12:16:35 +0000
@@ -53,3 +53,12 @@
 # continues to build and is installable for the few cases where its
 # really needed.
 blacklist amd76x_edac
+
+### Ubuntu Broadcom madness:
+# http://ubuntuforums.org/showpost.php?p=11446022&postcount=2
+blacklist brcm80211
+blacklist bcma
+
+# acc. http://ubuntuforums.org/showpost.php?p=11903104&postcount=18
+blacklist wl
+blacklist atl1c

=== modified file 'modules'
--- modules     2012-03-19 23:16:46 +0000
+++ modules     2012-06-03 12:14:58 +0000
@@ -5,3 +5,5 @@
 
 lp
 rtc
+# acc. to http://ubuntuforums.org/showpost.php?p=11903104&postcount=18
+brcmsmac


Could this be implemented automatically?

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https://bugs.launchpad.net/bugs/927794

Title:
  WLAN not working with Lenovo G570

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