Editing Install ubuntu 14.04

== check ubuntu version ==
 root@cory:~# lsb_release -a
 No LSB modules are available.
 Distributor ID:	Ubuntu
 Description:	Ubuntu 14.04 LTS
 Release:	14.04
 Codename:	trusty

== add appdev user ==
 root@cory:~# useradd -m appdev
 root@cory:~# useradd -m -d /home/appdev appdev
 root@cory:~# passwd appdev
 su appdev

* sudo with no passwd
 shell> su 
 shell> chmod +w /etc/sudoers
 shell> echo '${username} ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 shell> chmod -w /etc/sudoers
 shell> exit

== stop default apache2 ==
  root@cory:~# /etc/init.d/apache2 stop  
  * Stopping web server apache2

== fix /etc/sudoers error ==
* I change /etc/sudoers file cause some error like:
  >>> /etc/sudoers: syntax error near line 30 <<<

* for fix , run as root , then fix the /etc/sudoers file
 >pkexec su
 >vi /etc/sudoers file

== add alias for root ==
* check current user alias
  yufei@yufeidesktop:~$ alias
 alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'
 alias egrep='egrep --color=auto'
 alias fgrep='fgrep --color=auto'
 alias grep='grep --color=auto'
 alias l='ls -CF'
 alias la='ls -A'
 alias ll='ls -alF'
 alias ls='ls --color=auto'

* pkexec su - change to root
 pkexec su
 vi /root/.bashrc

you can find follow line
 if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
 fi

* create .bash_aliases , add the alias content to it.

==install .deb package ==
*To install a downloaded Debian (Ubuntu) package
 sudo dpkg -i packagename.deb
*To remove a Debian (Ubuntu) package (.deb)
 sudo dpkg -r packagename
*To Reconfigure/Repair an installed Debian (Ubuntu) package
 sudo dpkg-reconfigure packagename

==apt-get ==
 sudo apt-get install -f libavahi-compat-libdnssd1
 sudo dpkg -i synergy-v1.7.4-stable-c734bab-Linux-x86_64.deb

==install jdk ==
* download jdk
* unzip it 
 tar zxvf jdk-8u65-linux-x64.tar.gz
* move to /usr/loca/
 /usr/local/jdk1.8.0_65
 sudo ln -s /usr/local/jdk1.8.0_65 jdk

* add JAVA_HOME to ~/.bashrc