This team is a group of Lenovo G-series laptop owners and/or developers interested in getting it to work 100% under Linux (Lenovo G550, Lenovo G450, Lenovo G560, Lenovo G560e, Lenovo G565, Lenovo G575, Lenovo G460, Lenovo G555, Lenovo G455, Lenovo G650, Lenovo G570).

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sudo dmidecode -s system-product-name
sudo dmidecode -s system-version
lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/'

Specs:
http://www.notebookreview.com/default.asp?newsID=5205&review=lenovo+g550
http://www.lapspecs.com/wiki/lenovo+g550

Issues and solutions:
Broadcom BCM4312 no wireless. Possible solutions here:
Here is the best solution found so far:
http://ubuntuforums.org/showpost.php?p=8857311&postcount=461

Other possibilities:
1. Plugging in to a hardwired connection + allowing Ubuntu Karmic to do updates, rebooting and selecting "Broadcom STA Driver" under Hardware Drivers from System preferences.

2. http://www.backports.ubuntuforums.org/showpost.php?p=8362755&postcount=16

3. http://ubuntuforums.org/showthread.php?t=1288865

Broadcom BCM4312/hidden SSID. Possible solution here:
http://ubuntuforums.org/showthread.php?t=1009404