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ben@kubuntu-640WD:~$ dpkg --list grep -i 'muon'
dpkg-query: error: package name in specifier '-i' is illegal: must start with an alphanumeric character
ben@kubuntu-640WD:~$ sudo apt-cache policy muon libqtcore4 libqtgui4
[sudo] password for ben:
libqtcore4:
  Installed: 4:4.7.4-0ubuntu8.1
  Candidate: 4:4.7.4-0ubuntu8.1
  Version table:
 *** 4:4.7.4-0ubuntu8.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     4:4.7.4-0ubuntu8 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
libqtgui4:
  Installed: 4:4.7.4-0ubuntu8.1
  Candidate: 4:4.7.4-0ubuntu8.1
  Version table:
 *** 4:4.7.4-0ubuntu8.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     4:4.7.4-0ubuntu8 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
muon:
  Installed: (none)
  Candidate: 1.3.1-0ubuntu1~oneiric1~ppa1
  Version table:
     1.3.1-0ubuntu1~oneiric1~ppa1 0
        500 http://ppa.launchpad.net/echidnaman/qapt/ubuntu/ oneiric/main amd64 Packages
     1.2.1-0ubuntu1.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages
     1.2.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages