Can I upgrade Ubuntu 16.04 LTS to Ubuntu 18.04 LTS from already downloaded 18.04 LTS ISO ?
If can, How?
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This question has similar Q & A already at https://askubuntu.com/a/781410/39004 – Vineet May 07 '18 at 07:13
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»»already downloaded 18.04 LTS ISO«« : The default live DVD contains no packages → Not usable for an upgrade. – Knud Larsen May 07 '18 at 16:35
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No.
The official upgrade from LTS to LTS is possible when the 1st point release gets released (18.04.1). Current target for the release of the 1st point release is July 26th.
You can do sudo do-release-upgrade -d on a fully updated 16.04 if you want to upgrade from command line. Only do that when you know how to restore your backup.
Due to the changes between 16.04 desktop (unity) and 18.04 desktop (gnome 3), I would re-install anyways. Make sure you can restore a backup for your personal data.
Rinzwind
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1I saw we can still install Unity (3D compiz) on it, compiz woobly, full screen modes (3d scaled) and many other features are really cool and useful, I will 1st upgrade a notebook, if all is good I will the desktop, cant wait for July 26th :) – Aquarius Power Jun 29 '18 at 14:08