Why Ubuntu disconnects from Wi-Fi when turning on hotspot and how to solve this problem??
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5Does this answer your question? How do I create a WiFi hotspot sharing wireless internet connection (single adapter)? – Nmath Oct 13 '20 at 21:30
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The answer to this is quite simple.
You can use your WiFi adapter as a hotspot, or you can use it as a client to connect to another network.
You can't do both at the same time.

Nmath
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It can't be done from Network Manager but this should work https://askubuntu.com/questions/970445/how-to-create-hotspot-without-internet-connection – Jeremy31 Oct 13 '20 at 20:51
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I have used create_ap to use one wifi device to connect to a AP and use it as a hotspot at the same time – Jeremy31 Oct 13 '20 at 21:06
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1https://askubuntu.com/questions/318973/how-do-i-create-a-wifi-hotspot-sharing-wireless-internet-connection-single-adap That is the one – Jeremy31 Oct 13 '20 at 21:16
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2That's a good find and could be marked as a duplicate of this question. It does seem that in order to pull this off, that you either need two network interfaces or one of a handful of network adapters that have the capability. – Nmath Oct 13 '20 at 21:29