create symbolic link

sudo ln -s /usr/share/roundcube /var/www/roundcube

roundcube reconfigure

dpkg-reconfigure roundcube-core

sync time in debian

aptitude install ntp

list of debain mirrors

http://backports.debian.org/Mirrors/

apt compare remote and local version of the package

apt-cache -t wheezy-backports policy roundcube

apt-get install from backports

apt-get -t squeeze-backports install

install python package management

curl -O http://python-distribute.org/distribute_setup.py
sudo python distribute_setup.py
sudo easy_install pip

oprand % python

print 14 % 5

output:: 4

why?

because 14 - 4 = 10 / 5 - will have no remaining part

install java on ubuntu

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer