IcedTea Web Control Panel fails to start

[Lesseps]

Problem: the IcedTea-7 Web Control Panel fails to start, using menu or terminal (command line below).

$ /usr/bin/itweb-settings
/usr/bin/itweb-settings: 10: /usr/bin/itweb-settings: /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java: not found
$

Apport did not help. There is no trace of this in /var/crash/.

System:
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=13.04
DISTRIB_CODENAME=raring
DISTRIB_DESCRIPTION="Ubuntu 13.04"
$

Versions of packages:
$ dpkg -l icedtea* | grep ii
ii icedtea-7-jre-jamvm:i386 7u25-2.3.10-1ubuntu0.13.04.2 i386 Alternative JVM for OpenJDK, using JamVM
ii icedtea-7-plugin:i386 1.3.2-1ubuntu1.1 i386 web browser plugin based on OpenJDK and IcedTea to execute Java applets
ii icedtea-netx:i386 1.3.2-1ubuntu1.1 i386 NetX - implementation of the Java Network Launching Protocol (JNLP)
ii icedtea-netx-common 1.3.2-1ubuntu1.1 all NetX - implementation of the Java Network Launching Protocol (JNLP)
$

$ java -version
java version "1.7.0_25"
OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.13.04.2)
OpenJDK Server VM (build 23.7-b01, mixed mode)
$

Solved with:
$ env LC_ALL=C sudo update-alternatives --config itweb-settings
There are 2 choices for the alternative itweb-settings (providing /usr/bin/itweb-settings).

  Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-6-openjdk-i386/jre/bin/itweb-settings 1061 auto mode
  1 /usr/lib/jvm/java-6-openjdk-i386/jre/bin/itweb-settings 1061 manual mode
  2 /usr/lib/jvm/java-7-openjdk-i386/jre/bin/itweb-settings 1060 manual mode

Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-7-openjdk-i386/jre/bin/itweb-settings to provide /usr/bin/itweb-settings (itweb-settings) in manual mode
$

I used env LC_ALL=C just to obtain this message in English, for this report.

It happens in Ubuntu, Lubuntu and other variants. But not for a fresh install of Mint-17. So should probably be the case for fresh install of the original Ubuntu or relatives.

Perhaps or probably, left-overs from version 6 are the reason for the problem.

For this package (itweb-settings), have not found a filled bug.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[P (p92)]

please upgrade icedtea version to fix this related bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=759226