My laptop, which runs Ubuntu 16.04 LTS, recently started to give me a strange error. When the computer is turned on, it boots into a screen where a message is shown as "Your system is running on low graphics mode". If I proceed to boot the system, the system boots up however the on-board WiFi is not detected. My computer suffered a physical damage lately which may have caused some hardware to malfunction. Anyway, being unable to fix this strange error, I found a somewhat workaround for it in the web.
Following the steps shown below to workaround each time when the "Low Graphics Mode" error occurs on Ubuntu 16.04.
(1) Turn on the computer and wait till it lands on the "Your system is running on low graphics mode" error.
(2) Press the key combination Ctrl + Alt + F1 and login to the virtual terminal it provides.
(3) On this terminal, type the following command.
sudo service lightdm restart
(4) Now, when the GUI login prompt appears, login there and the desktop environment should load now without any issues.