Because of the low hand, when the ubuntu system prompts whether to upgrade to 18.04, I chose Yes. As a result, I log in again after the upgrade. The screen is blank and there is no icon. The display is abnormal due to the upgrade, and I have been at least 3 times. Then, I spent a whole morning Google solving the problem.
My graphics card model is AMD Radeon(TM) R5 M430. After logging in, I press ctrl+alt+F2 to open the command line interface and enter:
sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo update
sudo upgrade
Restart, the problem is solved.
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