App Center Always in 'Waiting' State Solution

Problem

Elementary OS users often find the App Center in a 'waiting' state or unresponsive. This issue even occurs with fresh installs, while the App Center in other distros works fine.

Solution

There are the solution:

1. Update the App Center application to a newer version if available.
2. Reinstall App Center by following these steps:

   sudo apt purge appcenter
   sudo apt purge packagekit
   

   Then Restart. After that, type:

   sudo apt install packagekit
   sudo apt install appcenter
   

   Once done, Restart.