dpkg -l "*icedtea*"
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  icedtea-6-jre- 6b23~pre11-0ub Alternative JVM for OpenJDK, using Cacao
ii  icedtea-6-jre- 6b23~pre11-0ub Alternative JVM for OpenJDK, using JamVM
un  icedtea-gcjweb <none>         (no description available)
ii  icedtea-netx   1.1.3-1ubuntu1 NetX - implementation of the Java Network La
ii  icedtea-plugin 1.1.3-1ubuntu1 web browser plugin based on OpenJDK and Iced
un  icedtea6-jre-c <none>         (no description available)
ii  icedtea6-plugi 6b21.1.3-1ubun web browser plugin to execute Java applets (