The PackageKit API has changed, and virt-manager's first run package install is currently broken in F18. Fixed upstream, should probably take in these 4 commits: http://git.fedorahosted.org/cgit/virt-manager.git/commit/?id=96ce9ac0b1257b66d0075c12aa572afe21eae0b0 http://git.fedorahosted.org/cgit/virt-manager.git/commit/?id=35bab2cc98ee4aef87f8a908c4951f2717455c8c http://git.fedorahosted.org/cgit/virt-manager.git/commit/?id=2163ba3a3035ea8fccd5113d53d120801ba12040 http://git.fedorahosted.org/cgit/virt-manager.git/commit/?id=53605cb21ba4a85853abb855a1a2c802b8e7482b
virt-manager-0.9.4-3.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/virt-manager-0.9.4-3.fc18
Package virt-manager-0.9.4-3.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing virt-manager-0.9.4-3.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-17333/virt-manager-0.9.4-3.fc18 then log in and leave karma (feedback).
In stable now