One of my good friend Fabrice Pasquier was helping me a lot while testing and installing JBoss in Linux Ubuntu.

Ubuntu is one of best breed from Linux family, its simple but very powerful.

You can install Ubuntu as a separate OS or as a dual OS with windows OS.

Some useful commands

• ls- all :: lists files/folder with access details
• chmod a+x <filename> ::  helps to execute the files with extensions like .sh, .rpm .bin etc.,
• ./shutdown.sh -s :: helps to shutdown jboss from where its started.
• ps - A :: shows a snapshots of current processes
• ps -A | grep bash :: shows processes started using bash
• ps  - A Top
• ps - A U username
• kill -9 <PID number> :: kill the particular process whose PID can be found using ps -A
• env :: shows the environment variables of the system
• env | grep path :: shows the PATH environment variable alone
• $PATH :: shows the path variable
• Ctrl + z :: pressing this will help you get the command prompt from a running process, just after this type bg and move the process to run in background.
• Ctrl + Atl + Backspace key :: restarts the graphical interface of the current user. 
• sudo mv <original location> <new location> , move files/folders
• less /etc/profile :: similar to more or type command, but this lets you also edit the file upon pressing hot keys
• ln -S :: creates a symbolic link of the file.
• which <filename> :: find and displays the filename location, escp for executable file
• find  / -name "mozilla" :: find and displays where the file/folder mozilla is located
• smbclient and samba server helps for networking with windows drives
• webmin and webmin-mysql helps to admin the system via web interface
• /etc/init.d/webmin start :: starts/restarts webmin
• gedit :: will open simple text editor
• gnome-terminal will open command window
• sudo xterm passwd :: will open x-terminal window for root user
• alien <-rpm file> :: alien -i <-rpm file> :: will helps to unpack and install rpm based files in debian system
• rm :: remove file
• rmdir :: remove directory
• mv :: move file
• cp :: copy file
• gphoto
• df
• du -s < file/directory name> will list the file/directory size in kb,mb format
• alias
• env :: displays the enviroment and syatem variable settings
• export $PATH=$PATH:...  sets paths
• chgrp :: change file/folder group
• chusr :: chnage file/folder user
• cat /proc/meminfo- to tell what memory used by processes
• free- show free memory
• watch "ls -al" monitors the current folder
• watch "du -s" monitors current folder byte size
• scp <filename> username@servername:directory location
makes SSL copy
• rsync Synchronize one folder to another across network
• tar - tar archive tool
• touch - update the file properties with current date and time 
• mysqldump -u username -p UNeMED_dbo generates sql scripts, mysql script /home/balaji/somefile.sql

To install JRE in firefox, try to find the jre plugin file under the jdk/jre folder and make a symbolic to it inside the firefox directory...

////////////////************ Draft document, yet to finish fully **************/////////////////////////////