UBUNTU Upgrade

UBUNTU can upgrade in two ways

1) ONLINE http://www.ubuntu.com/desktop/get-ubuntu/upgrade

2) OFFLINE Download alternative ubuntu from www.ubuntu.com (for example here taking ubuntu 10.04)

then open terminal and go to where the ISO file is located and type the following

sudo mount -o loop ubuntu-10.04-desktop-i386.iso /media/cdrom0 (press enter type your passwd)

after that

press ALT+f2 Box will appear in that type gksu sh /cdrom/cdromupgrade (press OK)

now upgrade will be started.