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My laptop dualboots both ubuntu 16.04 and windows 7 and detects and connects to most wifi networks very easily on both operating systems.

However, there is a certain wifi network I cannot get my laptop to even detect. The network has multiple usernames and passwords, both of which are needed to connect. I have these credentials, but my laptop won't even detect. Other networks in the area are detected and can be connected to.

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    Does it work in the same frequency? There are multiple bands around, and many older Wi-Fi cards do not support the newer 5GHz networks. – Aganju Apr 9 '17 at 17:22
  • How can I check this? – Null_Error Apr 9 '17 at 18:01
  • Google the model of the network card (and see the router's capabilities and settings) – Aganju Apr 9 '17 at 18:03
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You may not be able to connect to the because of frequecy incompatibility .There are five distinct frequency ranges: 2.4 GHz, 3.6 GHz, 4.9 GHz, 5 GHz, and 5.9 GHz bands that are alowed.Laptops dont cover all, this might be a reason it doesnt connect.

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