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Last evening i started the procedure to upgrade ubuntu 11.10 to 12.04 while not being at home and with a slow connection. During the upgrade procedure ubuntu told me that the required time with my connection was very long. Because of lack of time i decided to deny the upgrade and start it today, but today i can't find how to start it again because the upgrade button is not anymore visible !

What can i do to upgrade ubuntu without downloading the iso? Is there any terminal command that allow me to start the upgrade ?

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It would help to have more information on where in the upgrade process your Ubuntu thinks it is at. Could you please issue the command cat /etc/lsb-release in a terminal window and add the output to your question by editing it? (Please, as recommended in the faq, do not use a comment to respond.) – irrational John May 3 '12 at 3:01

Start update manager and there you will find a button so you can upgrade. enter image description here

If not you need to enable update manager to look for dist upgrades see: Update manager doesn't offer an upgrade from 11.10 to 12.04

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Type this in Terminal

 update-manager -d
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Press Alt+F2 and type update-manager -d then click on Update Manager then I was able to see update to 11.10. Hope your problem will also be solved by this.

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