After login xserver-xorg-core crashes on Ubuntu 16.04

Booting up my laptop which is Ubuntu 16.04 and then after logging in, I get a pop up message that there is a system problem and then another popup stating a program error. Has been happening during past week - so suspect problem from an update. When click on details, the first pop-up refers to a aport url. When click on details for second pop-up, the information given is xserver-xorg-core. I tried reporting, but looks like from the log it has only been reported once. However it is a consistent error for when I first boot up, which is daily since I am off grid and turn everything off every night. When I shut down and restart, most time I don't receive those two pop-ups again. Since I always keep restarting to make sure no errors, I have not noted any problems to other programs. But it is annoying since I limit my computer time to when I have daylight and this subtracts from my period of opportunity to use the computer.

Not sure what this xserver-xorg-core does, so did not want to just uninstall it, considering that the first error message states a SYSTEM problem.

If it is an update problem, is it possible for me to go to an earlier version? If so, could you give me the script I would use in the terminal? Or is it just safe to uninstall it from the terminal?

Thanks in advance...