Objective

Upgrade an existing Ubuntu installation 18.04 LTS to 18.10 Cosmic Cuttlefish

Requirements

You need an existing Ubuntu 18.04 LTS install with root privileges. The following link will provide you with an information on how to upgrade your current Ubuntu system to 18.04 LTS.

Difficulty

Easy

Conventions

  • # - requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
  • $ - requires given linux commands to be executed as a regular non-privileged user

Release Date

The Ubuntu 18.10 Cosmic Cuttlefish is expected to be releases in mid October 2018.

What's New

Current, the most prominent new features to be expected for Ubuntu 18.10 Cosmic Cuttlefish are:
  • GNOME 3.30
  • Kernel 5.0
  • New default Communitheme theme
  • Faster boot with new compression algorithms

Preparations

At this time your are only able to upgrade to Ubuntu 18.10 Development Branch. Upgrades to a final release will not be available until few days after the official Ubuntu 18.10 release date.

Before you trigger the upgrade make sure that you are already using the latest Ubuntu 18.04 Bionic Beaver and that it is fully updated.
$ sudo apt update 
$ sudo apt upgrade
$ sudo apt dist-upgrade
Remove all no longer required packages:
$ sudo apt autoremove

Upgrade to Ubuntu 18.10 procedure

Begin upgrade to 18.10 Cosmic Cuttlefish
First, open and edit /etc/update-manager/release-upgrades file and set Prompt=normal to avoid No new release found message.
start upgrade
Save the file and begin the upgrade process with the following upgrade command ans say y when prompted:
$ sudo do-release-upgrade -d
remove unwanted packages
Some packages may no longer be required. Answer y to confirm their removal.
Finish the upgrade to 18.10 by restart
Enter y to restart your system.
Ubuntu 18.04 is now upgraded to Ubuntu 18.10
Your Ubuntu 18.04 is now upgraded to Ubuntu 18.10 Cosmic Cuttlefish