I do not really know where else I should report this bug. I am using a Lenovo 110S.

Wifi does work without problems while using USBlive Xubuntu.
After installation it does not really work, even after updating.

Using following lines solved the problem for me:

sudo apt-get install linux-headers-generic build-essential git
git clone http://github.com/lwfinger/rtlwifi_new.git
cd rtlwifi_new; make; sudo make install