networks – ubuntu 16 lenovo y520 blue opening screen

I have some problems with Ubuntu 16.04 on my Lenovo (I'm also running Windows 10). First, the wi-fi did not work, so I managed to connect to the internet through an Ethernet cable. After that, I tried to update the operating system (either through sudo apt-get install or through that included application that shows all the available updates). After the installation of the operating system update, the update button was still displayed, so I thought it was an error and tried to restart. After that, when ubuntu was opening, a blue screen is shown, you can only see the cursor and sometimes an error is displayed and it says: could not enter ubuntu, try to restart (there is no success with that) . If you have any advice, please help me. Thanks in advance!