ali@Juventus:~$ frostwire 
Starting FrostWire...
Java exec found in PATH. Verifying...
1.4.2-02
OOPS, your java version is too old [java = 1.4.2-02]
You need to upgrade to JRE 1.5.x or newer from http://www.java.com
OOPS, unable to locate java exec in  /usr/lib/  hierarchy
You need to upgrade to JRE 1.5.x or newer from http://www.java.com
ls: /usr/java/j*: No such file or directory
OOPS, unable to locate java exec in  /usr/java/  hierarchy
You need to upgrade to JRE 1.5.x or newer from http://www.java.com
ls: /opt/j*: No such file or directory
OOPS, unable to locate java exec in  /opt/  hierarchy
You need to upgrade to JRE 1.5.x or newer from http://www.java.com
ali@Juventus:~$ dpkg -l "*sun-java*" | grep "^.i"
ii  sun-java5-bin         1.5.0-13-0ubuntu1 Sun Java(TM) Runtime Environment (JRE) 5.0 (
ii  sun-java5-jre         1.5.0-13-0ubuntu1 Sun Java(TM) Runtime Environment (JRE) 5.0 (
ii  sun-java6-bin         6-03-0ubuntu2     Sun Java(TM) Runtime Environment (JRE) 6 (ar
ii  sun-java6-jre         6-03-0ubuntu2     Sun Java(TM) Runtime Environment (JRE) 6 (ar
ii  sun-java6-plugin      6-03-0ubuntu2     The Java(TM) Plug-in, Java SE 6