GNOME Software/PackageKit lists only installed packages

I noticed that GNOME Software on my Fedora 24 installation only shows packages that are already installed (even in the *featured* and *editor's picks* sections). I also can't search for new packages to install. Here's a screenshot of the *Graphics* category. On the left side, it shows only installed packages. On the right side (from another computer), it shows the correct list: I found out that GNOME Software is a frontend for PackageKit, so I tried to use the CLI (pkcon). However, it also doesn't find most of the programs. For example, I wanted to search for *Shotwell* using the CLI. This is the output: [user ~]$ pkcon search name shotwell Searching by name [=========================] Finished [=========================] [user ~]$ On the other computer, pkcon finds the package: [user ~]$ pkcon search name shotwell Searching by name [=========================] Starting [=========================] Finished [=========================] Available shotwell-0.23.5-1.fc24.i686 (updates) A photo organizer for the GNOME desktop Available shotwell-0.23.5-1.fc24.x86_64 (updates) A photo organizer for the GNOME desktop Available shotwell-0.23.1-1.fc24.x86_64 (fedora) A photo organizer for the GNOME desktop [user ~]$ **How can I fix PackageKit to find all packages again?** ---------- **Edit:** Output of dnf repolist: repo id repo name status Dropbox Dropbox Repository 4 *fedora Fedora 24 - x86_64 49.722 google-chrome google-chrome 3 rpmfusion-free RPM Fusion for Fedora 24 - Free 352 rpmfusion-free-updates RPM Fusion for Fedora 24 - Free - Updates 277 rpmfusion-nonfree RPM Fusion for Fedora 24 - Nonfree 89 rpmfusion-nonfree-updates RPM Fusion for Fedora 24 - Nonfree - Updates 127 *updates Fedora 24 - x86_64 - Updates 9.817