What if ubuntu can surf the Internet but apt can't download something?

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When downloading a V4l library using ubuntu, you cannot download data

1. Ping Extranet: ping baidu.com

2. Download: the reason why sudo apt-get install libv4l-dev*, cannot be downloaded is that my linux has not been updated online for a long time.

3. Synchronize with the server: sudo apt-get update

4. Download again: sudo apt-get install libv4l-dev*

Note: be sure to connect to the network.

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