How to install the graphics card driver of ubuntu12.04 system

Source: Internet
Author: User
How to install the graphics card driver of ubuntu12.04 system-General Linux technology-Linux technology and application information, the following is a detailed description. My Lenovo C200 all-in-one machine is equipped with ubuntu12.04 and is running properly. Later, I added several groups and users. Users added After cannot open (sudo groupadd workroup/sudo useradd-G workgroup 123/sudo passwd 123 /. Then the computer prompts that the video card driver is abnormal and can only process in the lowest graphics mode and a single session. what wocould you likes to do? /Run in low graphics mode for just one session /...). But it just crashes. Again, the system prompts and crashes after the instance is restarted.
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