I'm currently having problems fixing my ubuntu 16.04 desktop.
I'm currently having problems like this: How to fix "The system is running in low-graphics mode" error?
I try running failsafeX but that failed. My next bet was opening terminal (ctrl + lt + f1) and run sudo apt-get install gdm or sudo apt-get install --reinstall ubuntu-desktop but install is not working and neither are sudo apt-get update and sudo apt-get install --fix-missing.
It's all can't find this or can't do this errors.