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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Installation of the echo canceller Oslec and DAHDI

Once I installed a Chinese TDM410P card for connecting analog telephone lines and a bundle of Asterisk + Dahdi.
Since the board has no hardware noise cancellation, Oslec had to be installed.
When making calls, there was no echo from the side of the analog telephone, but whoever spoke into the IP phone heard himself.

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