I have installed 14.06 64 KDE on a new Lenovo G500 with a Broadcom BCM43142 network device. Wifi is not working - in the KDE network control module for network wireless is greyed out. Wired is working just fine.
I have read and acted on the posts: viewtopic.php?f=52&t=29873 viewtopic.php?f=52&t=29873#p162319
These seemed promising but wireless remains greyed out on rebooting. Ideas welcome!