Can i update from "ubuntu-12.04-desktop-i386.iso" file?
Solution 1:
Upgrading by using the CD or USB image
If you are using 10.04 LTS or 11.10 and you either insert the live CD or boot from the live CD to start installing it will give a option of upgrading to 12.04. It will automatically detect installed applications and install the updated version of your applications also.
If you download an ISO, the recommendation is to perform a md5sum check to ensure both the ISO downloaded and the burned CD are valid.
- Upgrade from 10.04 LTS (here shown with dual boot):
NOTE: Upgrades from 10.04 to 12.04 are not activated yet, see this question for more detail:
-
Why is "No new release found" when upgrading from a LTS to the next?
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Upgrade from 11.10
Taken from 12.04LTS upgrade
Solution 2:
I tried that and did work for me. I think the desktop ubuntu-12.04-desktop-i386.iso CD iso does not include the upgrade packages.
My advice for you is: you should download ubuntu-12.04-alternate-i386.iso(which is got all the upgrade packages) and then mount using the following command.
sudo mkdir -p /media/cdrom
sudo mount -o loop ~/Desktop/ubuntu-12.04-alternate-i386.iso /media/cdrom
- A dialog will be displayed offering you the opportunity to upgrade using that CD. If the upgrade dialog is not displayed for any reason, you may also run the following command using
Alt+F2:
gksu "sh /media/cdrom/cdromupgrade"
Solution 3:
If you burn it to a cd and boot it, and start the installation process you should be able to select the "upgrade" option in the menu.
Solution 4:
Yes, you can! Just boot via Live CD/USB, click Install on welcome Page, after that, click 'Continue' (You can optionally download updates while installing). In the installation type, select "Upgrade Ubuntu 11.10 to Ubuntu 12.04 LTS" and click Install Now... You are done. This will keep your old files, etc while upgrading the OS.