Normally that's about all the preparation you need, except for the live disk you need if things go wrong. However, the changes from Lubuntu 18.04 to...
That particular upgrade from Lubuntu 18.04 to a later version wasn't recommended by the developers due to large changes in the environment from LXDE...
I'm using Lubuntu 18.04 LTS (I've been using it/Linux as my primary OS for about 2-3 years IIRC) and I'm receiving the message asking me if I want to...