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I upgraded Ubuntu to 20.04 and the setting for preferred WiFi frequency has disappeared. You can see a screenshot of the drop-down menu here:

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How can I get this drop down menu back?

References

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    Use nm-connection-editor. – heynnema Jun 1 '20 at 18:59
8

The dropdown menu was removed from the UI (I could not find the reason).

But there is a work-around, by checking the manual of nm-settings:

  • Locate the targeted WiFi connection profile in /etc/NetworkManager/system-connections/nameofconnection.nmconnection
  • edit with sudo nano /etc/NetworkManager/system-connections/nameofconnection.nmconnection
  • Under section [wifi] add following entry
    • for 2.4 GHz only band=bg
    • for 5 GHz only band=a
  • save changes and connection should use the new configuration
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    Or run the command that is posted as a comment on the question (nm-connection-editor in the terminal) – Plumpie Jul 24 '20 at 8:02

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