No solution but here's the workaround that finally worked for me...
(Ubuntu 14.014 stock kernel)

Download the latest driver (you might have to install git first):
git clone http://github.com/lwfinger/rtlwifi_new.git

Change into the new directory you just created:
cd rtlwifi_new

Compile and install the new driver:
make
sudo make install

Edit the settings for the driver:
echo "options rtl8723be fwlps=0 swlps=0" | sudo tee 
/etc/modprobe.d/rtl8723be.conf

It's probably a good idea to take a look at that file to make sure that
worked. Some people say the "swlps=0" part of the command above is
unnecessary. I'm not sure but it doesn't seem to be hurting anything.

Reboot.

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https://bugs.launchpad.net/bugs/1240940

Title:
  Need support for Realtek Wifi  card rtl8723be [10ec:b723]

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