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I want to install Ubuntu server from my downloader alternate iso file for the Ubuntu server, without rebooting my machine. In other word, I want to install it while I am still on a Linux/Ubuntu system.

How can I do this?

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Do you want to install it from an offline Ubuntu system? meaning install from a installed system without restarting? – Anwar Shah Jun 25 '12 at 14:56
Have you checked this‌​? – pl1nk Jun 25 '12 at 14:58

Follow the procedure described in Ubuntu installation guide here, until the step before Configure Apt. In this step you have to add the ISO as the repository source. To do this, follow the following steps:

  1. First mount the iso file in /media/apt directory. If that is not already exists, create that directory with sudo mkdir /media/apt command.

    sudo mount /path-to-iso-file /media/apt
  2. Then add this as repository source

    sudo apt-cdrom add 
  3. Then do sudo apt-get update, most probably it is not required.

Then follow the steps in the main documentation, until Install the Ubuntu Desktop step. In that step, the last command should be

    $ sudo tasksel install ubuntu-server

instead of sudo tasksel install ubuntu-desktop

Hope this will answer your question.

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