At the command line, login using your username and password (password will not show as you type) and then run command
Code:
sudo apt-get install xserver-xorg-video-intel
This is probably the bug that the intel driver is not installed at the time the OS is installed which I suffered from as well, though I could not even get to the command line.
If you run the recovery mode and exit without a reboot the system uses the backup graphics without the proper card driver, hence you getting to a GUI that way.
See https://ubuntuforums.org/showthread.php?t=2322941 for the thread I started about this.
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