If this still doesn't work, go back to the 3rd terminal ( ALT+ F3), login, and enter this command (same procedure): sudo apt-get -y install lubuntu-desktop Then reboot using the same command as before ( sudo reboot). If lxdm is not selected, select it by using the UP and DOWN arrow keys, and press ENTER to accept that selection. This will show a DOS-like dialog after a bit. If this does not work, try going back to the 3rd terminal ( Ctrl+ ALT+ F3), login, and enter this command (pressing ENTER after you have typed it): sudo apt-get -y install lxdm Then reboot your computer using this command: sudo reboot Note that the password will not show when you are typing it!): sudo apt-get update Enter these commands and press ENTER (or Return) after writing each one (you will have to enter your password when it shows something like password for USERNAME. From there you should be given a shell (a program that allows you to enter commands, sort of like windows' cmd.exe). You should be given an unix-style login prompt, so enter your username and password there. This might be incompatible with your graphics card therefore, search with sudo apt-cache search nvidia-+$ for the package you need, and install it. For example, on Ubuntu 16.04, nvidia-current points to the version: 304.131-0ubuntu3. In that case, search the latest compatible driver for your video card and install it. Please note that sometimes nvidia-current might install the wrong driver. If you're lucky enough, problem solved, you should be able to login to Unity. TL DR, just try logging into the shell ( Ctrl+ Alt+ F2 or whatever F between F1 and F6) and type sudo add-apt-repository ppa:graphics-drivers/ppa Its installer is quite capable too and it uninstalled successfully my hack-installed unstable version from Nvidia website. The solution here was to install package nvidia-current from Ubuntu repos it is an awfully outdated version, but it's tested properly at least. I realized I have Nvidia drivers from official website which are not really stable and tested (so I've read and also experienced in the past). I had this and after looking at /var/log/Xorg.0.log I found out that it's a Nvidia problem (there was a line saying Xlib: extension "GLX" missing on display ":0).
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