As already mentioned above, upgrades from 17.10 will not be enabled until a few days after 18.04's release and upgrades from 16.04 LTS will not be enabled until a few days after the 18.04.1 release which is expected in late July 2018.As a result, your upgrade attempt may result in a message The upgrade should take a bit of time.
If you forgot to do that (or upgrade from an earlier release) you can install the multimedia codecs manually via the Software app: Click on an app launcher icon to open an app. Ubuntu 16.04 finally lets you choose where the Unity launcher is positioned.
You’ll find it jam-packed with common-sense tips, nifty tweaks and helpful advice. Feel free to use the comments section at the bottom of this article to share you own post-install must-dos with other readers. Firstly, not everyone is reading this list on release date.
It doesn’t matter if you’re a brand new Ubuntu user (welcome! And even if you are, a few last-minute security, stability or bug fixes may have slipped out between the installation image being created and you installing from it — bugs don’t stick to the same deadlines that developers do!
This way, you can set it up to upgrade and walk away. Upgrades from 17.10 will not be enabled until a few days after 18.04's release.
Upgrades from 16.04 LTS will not be enabled until a few days after the 18.04.1 release expected in late July.