root@mysystem:~# apt update && apt dist-upgrade
Hit:1 http://de.archive.ubuntu.com/ubuntu yakkety InRelease
Hit:2 http://security.ubuntu.com/ubuntu yakkety-security InRelease
Hit:3 http://de.archive.ubuntu.com/ubuntu yakkety-updates InRelease
Hit:4 http://de.archive.ubuntu.com/ubuntu yakkety-backports InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@mysystem:~# apt-get install update-manager-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
update-manager-core is already the newest version (1:16.10.10).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@mysystem:~# nano /etc/update-manager/release-upgrades
root@mysystem:~# do-release-upgrade -d
Checking for a new Ubuntu release
No new release found
root@mysystem:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.10
Release:    16.10
Codename:   yakkety
root@mysystem:~#

root@mysystem:~# do-release-upgrade -d
Checking for a new Ubuntu release
No new release found
root@mysystem:~#

sudo apt update && sudo apt dist-upgrade

sudo apt-get install update-manager-core

sudo nano /etc/update-manager/release-upgrades

Prompt=normal

do-release-upgrade -d

lsb_release -a

vim /etc/apt/sources.list

:%s/yakkety/artful/g

apt update && apt upgrade