The mobile phone WIFI is connected to the computer hotspot, but cannot connect to the Internet?

MIT App Inventor Help
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video:

The Ubuntu 20.04 LTS computer is set as a hotspot and connected to the Internet.

The Android phone successfully connected to the Ubuntu computer hotspot.

However, Android phones can no longer connect to the Internet.

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What is the reason?

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Is the hotspot connected through to the internet ?

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Computer hotspot: can connect to the Internet
Mobile phone: Can't connect to the Internet

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Mobile phone display:: Connected. no internet.