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sudo apt update && sudo apt dist-upgrade

Hit:1 http://ports.ubuntu.com/ubuntu-ports xenial InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports xenial-security InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports xenial-updates InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
7 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done'
The following packages have been kept back:
xorg xserver-xorg xserver-xorg-core xserver-xorg-input-all
xserver-xorg-input-evdev xserver-xorg-input-void xserver-xorg-video-dummy
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded
When i open update-manager the following comes up:
You don't have the required privileges to perform this action.
I press "Ok", this comes up:
the software on this computer is up to date.
However, Ubuntu 18.04.2 LTS is now available (you have 16.04)
i press Upgrade.
Nothing happenes.
sudo do-release-upgrade
Checking for a new Ubuntu release Please install all available updates for your release before upgrading.
lsb-release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:    16.04
Codename:   xenial
Using A Chromebook R13 with crouton installed
                Welcome to StackOverflow! Please read How to Ask and take the tour as your question does not fit any of our guidelines
– Tamir Klein
                Apr 27, 2019 at 11:55
                I think this should be posted instead at AskUbuntu. See their help page for what's on-topic.
– Gino Mempin
                Apr 27, 2019 at 13:09
Upgrade Ubuntu 16.04/17.10 to Ubuntu 18.04 with the Graphical Update Manager
First of all, fire up a terminal window and run the following command to update existing software packages.
sudo apt update && sudo apt dist-upgrade
After upgrade run this command
update-manager
After checking for updates, the update manager will tell you that Ubuntu 18.04 is now available. Click the Upgrade button.
That all you need.
        
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