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Normally when we update the Kernel or big updates from our distro, the kernel is also updated.
This causes the graphics module is not included in the new kernel.
Because the new kernel is not configured to work with NVIDIA drivers installed,
causes the GUI does not load and will not go past the black screen of the Terminal Classic (tty1).
The easiest way to fix this is to boot the kernel in question (default always does the most recent)
and once we are in Terminal mode (because the environment will not start), run the following command:

sudo apt-get --reinstall install nvidia-kernel-dkms

Then finally this one, which will create our new file xorg.conf :

sudo nvidia-xconfig

Restart the computer and it should boot the system perfectly.
More information: Here

Thank you for this! I ran in this issue and it took me two hours (I'm a noob when it comes to error solving in command line) to solve the "No GUI problem after upgrade" by purging all nvidia-related packages and the whole x server and x configuration files and reinstall them all.
So your advice will help me get through it next time there is an upgrade pack