I'm using Ubuntu 15.04. I want to update to 16.04. But the Software updater does not show the required update. How do i update?
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2Wait some more hours – Mostafa Ahangarha Apr 21 '16 at 07:51
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Don't. At least not yet. I did it and lost like 8 hours of my live getting my system working again. – Florian Wendelborn Apr 22 '16 at 20:22
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2Possible duplicate of How to install software or upgrade from an old unsupported release? – muru Apr 22 '16 at 20:40
3 Answers
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First make sure that your software is up to date. (run update manager) Than open the terminal Ctrl+Alt+T and run this command
sudo update-manager -d
Hit Enter and enter your password when asked.
Of course, be sure to make backup of any important data. It should not alter them, but you never know.

NonStandardModel
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Official instructions found here: https://wiki.ubuntu.com/XenialXerus/ReleaseNotes – NonStandardModel Apr 21 '16 at 08:04
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1Don't do this, unless you want the development release! (As of the 21st of April, 09:34 UTC) – grooveplex Apr 21 '16 at 09:35
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In order to upgrade your distribution you may give this a try:
sudo apt-get dist-upgrade
As the manual page itself explains:
dist-upgrade dist-upgrade in addition to performing the function of upgrade, also intelligently handles changing dependencies with new versions of packages; apt-get has a "smart" conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less important ones if necessary.
It'll upgrade the distro to its latest version.

Devin Hudson
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First you need to upgrade to 15.10, then you can upgrade to 16.04.
From a terminal window:
sudo apt-get update
sudo apt-get upgrade
Reboot if asked.
sudo do-release-upgrade
Answer questions and reboot as required. Now you should be at 15.10
sudo do-release-upgrade
Answer questions and reboot as required. Now you should be at 16.04

David
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