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After upgrading from Ubuntu 16.04 to 18.04, facing some sort of weird things. This problem is recently occurring, where a window pops up out of nothing with title Network Hotspot and exits within a second.

Hotspot login dialog

I'm using an Asus Laptop with Intel Core i3 400 SL, 1.7GHz, 4GB Ram, 1TB HDD.

This doesn't seems to be hampering my Internet connection.

If any one knows how to fix this issue it would be helpful for me.

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    Is your WiFi connection stable? This happens to me when my router takes too long to restart a connection to the Internet. Ubuntu thinks it is connected to a hotspot that requires a web login (Such as the one at airports or restaurants). The page disappears when Ubuntu finally sees that is already connected to the Internet. The way that works, is that the OS connects to a preset non-HTTPS URL, in case of Gnome it is using nmcheck.gnome.org/check_network_status.txt. If it were a hotspot, the local router would automatically redirect to its login page. – Dan Oct 1 '18 at 20:08
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    I agree with @Dan: run a continuous ping 1.1.1.1 in a terminal and look whether you have a disconnection there. Video is buffered, so you won't notice a hiccup there... – Fabby Oct 3 '18 at 17:45
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    @Fabby's comment wasn't a solution but more of a troubleshoot. Since you say there is no drop when pinging, I think the issue is on the router. On my router, I have an option which allows it to disconnect from the internet when idle, and reconnects to it after attempting to use it. Maybe you have the same option. – Dan Oct 10 '18 at 11:18
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    I'm voting to close this question as off-topic because This is an Android HotSpot issue and KeepAlive needs to be enabled on the phone. – Fabby Oct 10 '18 at 15:28
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    @M.A.K.Ripon All I did was just log in to my router and disable that feature completely. It wasn't an Ubuntu issue, it was an issue with my router. – Dan Oct 10 '18 at 16:31