hostname //ubuntu

# vim /etc/hostname
# vim /etc/hosts

# /etc/init.d/hostname.sh
# hostname

LTS ubuntu

Ubuntu 12.04 LTS 2012/?---------------------------------------------------------------2017/?
Ubuntu 10.04 LTS                                         2015/?

Ref>
https://wiki.ubuntu.com/LTS?action=AttachFile&do=get&target=ubuntu-release-cycle-2.png

A new LTS version is released every 2 years. In previous releases, a Long Term Support (LTS) version had 3 years support on Ubuntu (Desktop) and 5 years on Ubuntu Server. Starting with Ubuntu 12.04 LTS, both versions will receive 5 years support. There is no extra fee for the LTS version; we make our very best work available to everyone on the same free terms. Upgrades to new versions of Ubuntu are and always will be free of charge.

remove libreoffice uninstall

1)
sudo apt-get remove libreoffice*.*

2)
sudo apt-get update
sudo apt-get remove --purge libreoffice
sudo apt-get clean
sudo apt-get autoremove
//sudo apt-get install openoffice

3)
sudo apt-get remove libreoffice*.*
sudo apt-get purge
sudo apt-get autoremove
sudo apt-get autoclean

GNOME 3

ubuntu 11.04 Unity(default)

//add Gnome 3
sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install gnome-shell

 //Ubuntu GNOME Shell Desktop

gcc //ubuntu

sudo apt-get update

sudo apt-get install build-essential

env
sudo apt-get install build-essential gcc make

editor
sudo apt-get install vim emacs

lib
sudo apt-get install libc6 libc6-dev

mainpage
sudo apt-get install manpages-dev

//info gcc

//gcc -v
//cat /proc/version

//uname -a

//lsb_release -a