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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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:
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
Then add this as repository source
sudo apt-cdrom add
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
sudo tasksel install ubuntu-desktop
Hope this will answer your question.