I have lenovo Z580 laptop and dual-booted my system with windows 8 and ubuntu 13.04. I can connect to internet using windows 8(both wired & wireless) but cannot connect using ubuntu(both). It always shows me that "I am in offline mode"
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It looks like your laptop might use the infamous Broadcom chipset 14e4:4727, which needs special attention.
From http://ubuntuforums.org/showthread.php?t=2092561,
Try running
lspci -nn | grep 0280
If your device is the Broadcom 14e4:4727, then run
sudo apt-get install --reinstall bcmwl-kernel-source
To re-install the drivers. Then reboot and try the connection again.
Travis G.
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