Ubuntu Budgie Linux DistroUbuntu Budgie is more or less a macOS-fied version of Ubuntu – an operating system already known for its reliability, community support, and approval from professionals around the world. /mac-os-catalina-theme-for-ubuntu.html.

When users try to setup Airport Express, Airport Utility recognised it. But when they go to setup it provides “An unexpected error occurred try again” error message.
Solution 1:
This issue might happened if IPv6 has beed disabled. So enable IPv6 for network interface.

1. Go to Apple menu -> System Preferences and select Network.
2. Lower left corner if lock icon appears, click it and enter admin name and password.
3. Select your network service in the list (WiFi or Ethernet) and press Advanced.
4. Select TCP/IP tab.
5. From the configure IPv6 popup menu, select Link-local only.
6. Click OK and select Apply.

Airport Utility For Old Airport Express El Capitan Peru

Device (Airport Express, AirPort Time Capsule, Airport Extreme) should now reappear in AirPort Utility.
Note : This guide for OS X Lion or Mountain Lion.
Solution 2: Reset AirPort Express
Reset AirPort Express. If the Unexpected message reappears, reset the AirPort Express again.
Solution 3: Try the setup on iPad

Try the setup on iPad. Go to Settings -> WiFi. Under “Setup a new AirPort Base Station”, tap AirPort Express. Follow the prompts.
Solution 4:
Users getting same error when they try to connect it to existing Airport Extreme wireless network.
Software: AirPort Utility 6.3.2 and OS X 10.9.5
Temporarily connect the AirPort ExPress to iMac with an Ethernet cable.
Other fixes :-

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Aug 01, 2012  Stream All Mac System Audio Over AirPlay in OS X. Wow–so pleased to find this trick–up to now, my MacBook Pro (2012 running El Capitan) was the only device not able to stream music from radio station web site or iTunes using my Airport Express connected to my analog stereo system. Jul 18, 2018  In my case the firmware of the Airport Express 1gen 802.11n was to old to be recognized under El Capitan / Sierra / iOS 9.3.5 / iOS 10. Configured and updated the firmware of the AE from 7.3 to 7.6.8 with Snow Leopard (USB Boot). Jan 17, 2017  Changed my router today. To extend my wifi I have an Airport Express in the kitchen & another in the lounge. The lounge unit is an old style Airport Express that.

Airport Express Setup

• Disconnect the ethernet cable from iMac with the AirPort Express connected to wireless hub with a cable.
• You might set the WiFi name to hidden. Changing the WiFi network unhidden will fix your problem. When you edit your Main device with in AirPort Utility, go to Wireless tab -> Wireless Options settings. Find the settings marked “Create hidden network” uncheck the setup process.
• Check the firewall settings. Navigate to System preferences > Security & Privacy > Firewall and uncheck “Block all incoming connections”.