Comment 12 for bug 1308348

As I wrote above, the problems started during the upgrade from 13.10 --> 14.04 but not before the upgrade from kernel 3.11 (as in saucy) to 3.13 (as in trusty). Kernel 3.11 from 13.10 works under 14.04 without problems!

While the lsmod output states that all relevant kernel modules (ath/athk5/mac80211/cfg80211) are loaded for both kernels, 3.11 & 3.13, the dmesg output for kernel 3.13 shows me fewer entries for all these four modules. That could point to some incorrect interplay between different kernels and general configuration settings...

What is the workaround for me:
1. press the "Shift" key during boot to unhide the grub boot menu.
2. Select from the Grub boot menu the entry for kernel 3.11
3. Go (with network, network applet and all indicators now being present).

That could provide some first aid for desperate upgraders that come from 13.10 to 14.04 having the same problem. It obviously will not help in the case of a fresh 14.04 install...