What is wrong with this?Now, I can't restart the computer. If restart, must reinstall the system and video card driver, can be normal use
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You will likely get quicker & better help asking this question in a forum dedicated to Ubuntu. Those guys typically know this stuff pretty well. Most this forum is Windows help, there are some Linux folks here too, but for speed, I'd ask your question elsewhere too.
Everything takes time, especially the new Linux distros and their graphics drivers
and not only for Canonical, AMD has not yet released any stable version of its drivers for Bionic Beaver ... keep calm and in a short time you will enjoy