It seems to be solved in my case.
The topic is getting the wireless to work on an AO722, an Acer Aspire One 722. The wireless card is a Broadcom. I use Ubuntu on all my other computers, but found problems in this case. I tried Mint Julia, or Mint 10, but I set Mint aside, because I didn't like it as well, and it didn't solve the problem.
Previously I did a bunch of things to try to get wireless to work on the Acer running Ubuntu 12, but now I'm trying to start from scratch, fresh install.
Fresh install begins:
download updates while installing
install this third-party software
erase disk, use whole disk
noticed a brief message about something not being ready, or mounted, swap or something.
boot with ethernet plugged in
notice the 'restricted drivers available' icon and balloon in top left area
I do not yet check for updated software, in case doing so causes problems
unplug ethernet, tap connection triangle, choose my wireless network
it asks for passphrase, I enter it
After the above, various diagnostic command output, including:
cat commands to syslog.
cat to NetworkManager.conf.
I have made no changes to BIOS.
lspci -nn | grep 0280
07:00.0 Network controller : Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
lsmod | grep -e wl -e bcma -e brcmsmac
wl 2646601 0
lib80211 14040 1 wl
bcma 25651 0
brcmsmac 540875 0
mac80211 436455 1 brcmsmac
brcmutil 14675 1 brcmsmac
cfg80211 178679 2 brcmsmac,mac80211
crc8 12781 1 brcmsmac
cordic 12487 1 brcmsmac
dmesg | grep -e brcm -e wlan
[ 14.887388] brcmsmac 0000:07:00.0: bus 7 slot 0 func 0 irq 11
[ 14.887516] brcmsmac 0000:07:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 14.887530] brcmsmac 0000:07:00.0: setting latency timer to 64
[ 25.026114] ieee80211 phy0: brcms_ops_config: change monitor mode: false (implement)
[ 25.026130] ieee80211 phy0: brcms_ops_config: change power-save mode: false (implement)
[ 25.027779] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: false (implement)
[ 25.028669] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 25.030023] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 243.810470] wlan0: authenticate with 00:13:46:cf:85:e8 (try 1)
[ 243.816076] wlan0: authenticated
[ 243.822941] wlan0: associate with 00:13:46:cf:85:e8 (try 1)
[ 243.826124] wlan0: RX AssocResp from 00:13:46:cf:85:e8 (capab=0x431 status=0 aid=3)
[ 243.826136] wlan0: associated
[ 243.827400] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: false (implement)
[ 243.827414] ieee80211 phy0: brcmsmac: brcms_ops_bss_info_changed: associated
[ 243.827434] ieee80211 phy0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 0 (implement)
[ 243.827967] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 245.954629] ieee80211 phy0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 1 (implement)
[ 256.160307] wlan0: no IPv6 routers present
cat /var/log/syslog | grep -i error
May 3 03:44:16 aopup-AO722 kernel: [ 13.651499] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
May 3 03:47:59 aopup-AO722 NetworkManager: get_secret_flags: assertion `is_secret_prop (setting, secret_name, error)' failed
cat /var/log/syslog | grep -i warn
May 3 03:44:21 aopup-AO722 NetworkManager: <warn> failed to allocate link cache: (-10) Operation not supported
May 3 03:44:22 aopup-AO722 NetworkManager: <warn> Trying to remove a non-existant call id.
May 3 03:45:47 aopup-AO722 kernel: [ 110.318091] EXT4-fs (sdb1): warning: maximal mount count reached, running e2fsck is recommended
May 3 03:47:42 aopup-AO722 dnsmasq: warning: no upstream servers configured
I would like to use both ethernet and wireless, due to unpredictability of circumstances.
At this point, ethernet unplugged, wireless connected, I tell the computer to shutdown. It shuts down normally. On previous experiments it would hang while shutting down with wireless connected.
I will now turn it on, ethernet cable unplugged. Recall that at this point I have not sought any restricted drivers or new software. Everything boots, no freezing, it has found the wireless connection and connected. I see it wants me to download some packages. I will reboot first. It shuts down normally, starts normally, connects to the wireless. Now I try a Fn-Zz experiment. Press power button then, and everything seems normal.
Okay, is it time to fetch some packages? By the way that message I can never quite read on bootup is approximately "the disk drive for cryptswap is not ready yet".
Click on updates manager. There are 47. I click "install updates". Update manager asks me to restart. I click the restart button. Shuts down normally, starts normally, finds the network, no freezing.
Until further notice, I guess that's it. Solved! Unless you have comments. Thank you very kindly for your help. I guess my impression is that not getting the restricted drivers made the difference. Dare I peek in the restricted drivers settings area?? Might tempt fate to do that.