As the recently released Kubuntu 21.04 with beautiful Plasma 5.21 makes its way into the world, inevitably other things come to their end.
Kubuntu 18.04 LTS was released in April 2018, and reached ‘End of Life’ for its 3 years of flavour support on 1st May 2021. All Kubuntu users should therefore switch to a newer supported release.
Download a supported release or upgrade from 18.04 to 20.04 LTS.
The Kubuntu team would thank users of all releases, especially for the amazing additional community support on IRC, forums, mailing lists, and elsewhere.