After some searching analyzing my kernel log, I discovered that's happening because some kind of incompatibility with my current video card driver. So, I just ran sudo apt install nvidia-384 and it worked well.
This is a problem with the nouveau driver. I have had the same problem on different computers with different effects. Recently I could not open the graphical interface under 18.04.
One solution is to install the proprietary NVidia driver using the graphical interface (software-properties-gtk) or in the terminal (ubuntu-drivers).
In the ...
I had the same issue on Ubuntu 18.04 with a Nvidia GTX 1060 on the 5.3.0-26 Kernel (but even earlier) and got the following errors (check with sudo journalctl -xe) :
- Error looking up permission: GDBus.E
- failed to set screen _ICC_PROFILE
- Can not get _NET_WORKAREA
Neither the gnome-shell-extension EasyScreenCast@iacopodeenosee.gmail.com nor unite@...