So, Ctrl+Alt+F1 does displays the text session and you can log into it,
right?
If so, plug an Ethernet cable and type the following commands ('sudo' will
ask for your password and, again, it is normal not to have a visual feedback
after every character you type), taking care of not forgetting any character:
$ echo 'deb http://linux-libre.fsfla.org/pub/linux-libre/freesh/ freesh main'
| sudo tee -a /etc/apt/sources.list
$ wget https://jxself.org/gpg.inc
$ sudo apt-key add gpg.inc
$ sudo apt update
$ sudo apt install linux-libre-lts
$ sudo reboot
A newer kernel (Linux-libre 4.9) will boot and hopefully show you graphics.
If you want to understand what those commands are about (and maybe choose
another version of Linux-libre), read https://jxself.org/linux-libre/
