Solving black screen problems in Ubuntu Server 16

I noticed somehow after installing Ubuntu Server 16.04 LTS that when booting the system, the monitor does not display the login and password entry line, and every time the black screen, the system does not respond to keystrokes, and the system has booted and you can connect to it via SSH.

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Solution of the error when opening wp-admin after the update

I noticed somehow when upgrading WordPress to version 4.7 that after the update wp-admin does not open, instead of the admin window there is an empty window and in the address bar of the browser the following address:

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