Ubuntu 16.04 Internal Error

Hi, I'm new to ubuntu and recently i just installed Ubuntu 16.04 LTS from usb. It works well on my thinkpad T460 for several days until the internal error occured today. I tried restarting my laptop, then log in. However, when i logged in, the launcher and the menu bar (File, Edit, View bar) are gone. I am not sure what the internal error details are since i didn't screenshot and remember them.

Any help is appreciated, thank you.

*note: I have updated my Ubuntu 16.04 LTS to 16.04.01 from the command sudo apt-get upgrade and I've also sudo apt-get update. So the Ubuntu I'm using is already up-to-date.
The terminal seems to be working but needed to be opened by ctrl-alt-T
I'm typing this thread from firefox and i opened the firefox by typing firefox on the terminal.

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Ubuntu 16.04 Internal Error