This is most likely due to a bug in kernel 4.4.0. You can either wait for the official update, or install newer kernel which solved the bug.
32 Bit
Run following command on terminal to download kernel 4.4.8 on 32 bit machine :
cd /tmp
wget \
kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.25/linux-headers-4.4.25-040425_4.4.25-040425.201610161231_all.deb \
kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.25/linux-headers-4.4.25-040425-generic_4.4.25-040425.201610161231_i386.deb \
kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.25/linux-image-4.4.25-040425-generic_4.4.25-040425.201610161231_i386.deb
Install the downloaded kernel :
sudo dpkg -i linux-headers-4.4*.deb linux-image-4.4*.deb
64 Bit
Run following command on terminal to download kernel 4.4.8 on 64 bit machine
cd /tmp
wget \
kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.25/linux-headers-4.4.25-040425_4.4.25-040425.201610161231_all.deb \
kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.25/linux-headers-4.4.25-040425-generic_4.4.25-040425.201610161231_amd64.deb \
kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.25/linux-image-4.4.25-040425-generic_4.4.25-040425.201610161231_amd64.deb
Install the downloaded kernel :
sudo dpkg -i linux-headers-4.4*.deb linux-image-4.4*.deb
After installation is complete, update grub
and reboot your computer. Choose your new kernel on grub.
sudo update-grub
sudo shutdown -r now