A false fault without sound in Ubuntu

I thought of watching a DVD film in Ubuntu. Because the corresponding playing software has been pre-installed in Ubuntu, the disc is directly placed in the bracket. After the system senses it, the playback software is automatically enabled, but an error message is displayed, prompting you to download the encoder and check the dependency software. For me, follow the default prompts. After waiting for a while, the download is complete, prompting you to start the installation, and asking for confirmation-of course, you need to confirm. After a short wait, the software installation is complete, but during playback

I thought of watching a DVD film in Ubuntu.

Because the corresponding playing software has been pre-installed in Ubuntu, the disc is directly placed in the bracket.

After the system senses it, the playback software is automatically enabled, but an error message is displayed, prompting you to download the encoder and check the dependency software. For me, follow the default prompts.

After waiting for a while, the download is complete, prompting you to start the installation, and asking for confirmation-of course, you need to confirm.

After a short wait, the software was installed, but it was found that the playback speed was very slow, much slower than the playback speed, and the sound was even slower. At that time, I did not notice that, there is no sound at this time.

I changed a CD to listen to music, and the results won't work either.

When viewing the system-system management-Logon window, in the auxiliary function item, click the music on the login screen, and no sound is found.

In System-system management-hardware driver, there is no required settings. The window prompts that this system does not use proprietary drivers.

In the system-system management-hardware test, the system has tested AUDIO for a long time and there has been no progress.

I have read a few articles and I have not mentioned many practices to solve the silent problem.

If you want to have a RECOVER item during system startup, you are ready to restart.

The restart is over. When you log on, there will be a sound. When you insert a CD, the video will be played normally and the sound will be normal.

In fact, this time may be a false fault, but after installing the software, you may need to restart the system, but I have not restarted it. After using the RECOVER option, no software is uninstalled. If there is no sound, it is estimated that it alone cannot be solved.