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but I want to continue…
Don’t worry! 16.04 Budgie Remix will not self destruct. The underlying pinnings of Ubuntu will keep you updated. Many components share the Ubuntu GNOME support arrangements and will receive updates until May/June 2019. The key linux kernel is updated through Ubuntu itself for 5 years. However our strong recommendation is that you move to 18.04.1 as soon as it is practical for you.moving forward
18.04.1 will be automatically announced through a prompt for all 16.04 users mid July. Just upgrade when prompted and finally run the “Budgie Complete Installation” menu option to finish. You’ll then be on the full 18.04.1 release. Some of the packages that were installed as part of the budgie-remix backports PPA will be uninstalled as part of the upgrade. Use budgie-welcome to reinstall anything that is removed. We also recommend you reset the panel to benefit from the revised Pocillo theme and applets:nohup budgie-panel --reset --replace &
Please refer to the community wiki for more help:
https://help.ubuntu.com/community/Upgrades
Also, Ask Ubuntu has an excellent guide to help you upgrade:
http://askubuntu.com/questions/110477/how-do-i-upgrade-to-a-newer-version-of-ubuntu
As an alternative you might want to backup your important 16.04 data and do a fresh install – good way for a thorough spring clean!