Public bug reported:

After updating to 1.12.4-1ubuntu1, several Lubuntu users have reported
WiFi is broken. I can reproduce this with one of my laptops.

Bringing the connection up with nmcli reveals this:

$ nmcli connection up id MY\ SUPER\ SECRET\ SSID
Error: Connection activation failed: The Wi-Fi network could not be found

After downgrading to 1.12.2-0ubuntu5 and running `sudo systemctl restart
network-manager.service`, the WiFi connects without issue.

** Affects: network-manager (Ubuntu)
     Importance: Critical
         Status: Confirmed


** Tags: regression-update rls-cc-incoming

** Changed in: network-manager (Ubuntu)
       Status: New => Confirmed

** Changed in: network-manager (Ubuntu)
   Importance: Undecided => Critical

** Changed in: network-manager (Ubuntu)
    Milestone: None => ubuntu-18.10

** Tags added: regression-update rls-cc-incoming

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https://bugs.launchpad.net/bugs/1796516

Title:
  WiFi connections are broken after update to network-manager 1.12.4

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