Updating ubuntu version
It essentially scripts the traditional Debian approach.
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.
Thanks to Debian's upgrade process, it should be relatively simple to either upgrade Ubuntu 16.04 to 18.04 (both LTS) or to upgrade Ubuntu 17.10 to 18.04 LTS Bionic Beaver.
This will help to ensure that the difference between packages is as small as possible.
This notification does not always appear instantly. Also bear in mind that, on release day, the Ubuntu servers are extremely busy and upgrades can take longer than expected.
If you don’t want to wait, or want to upgrade early, you can do so.
In general I would advise LTS users to only upgrade to LTS releases as this path gets more thoroughly tested.
But things aren’t guaranteed to go well for interim upgraders either.
Our full Ubuntu 17.04 review (published later) will give you a better look at the compelling (and not so compelling) reasons to upgrade.
As a result, your upgrade attempt may result in a message The upgrade should take a bit of time.
Chances are, every package on the system will be upgraded.
When the Ubuntu upgrade does finish, reboot the system.
When the system comes back up, you'll be running Ubuntu 18.04 LTS Bionic Beaver! You should notice that your login screen is different, especially if you were on 16.04. Just be especially careful of any external repositories and version upgrades like PHP.
To manually upgrade to Ubuntu 17.04 you need to run the following command in a new terminal window: flag is for ‘development version’ which, regardless of when you upgrade, you’ll probably need to use.