Conecte-se à internet por fio e execute
sudo apt-get install dkms
wget https://launchpad.net/~hanipouspilot/+archive/ubuntu/rtlwifi/+files/rtlwifi-new-dkms_0.5_all.deb
wget https://launchpad.net/~hanipouspilot/+archive/ubuntu/rtlwifi/+files/linux-firmware_1.144%2Bar3012_all.deb
sudo dpkg -i rtlwifi-new-dkms_0.5_all.deb
sudo dpkg -i linux-firmware*.deb
e reinicie.