Description of problem:
bash: okular: command not found...
Install package 'okular' to provide command 'okular'? [N/y] y
* Waiting in queue...
* Running... Failed to install packages: Failed to find okular;4.12.5-1.fc20;x86_64;updates
Version-Release number of selected component (if applicable):
Steps to Reproduce:
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This should be fixed in F21+ where PackageKit uses the hif backend instead of yum.