Kubuntu 20.04 installation is largely straightforward and trouble free. The only issue I had was selecting the appropriate option for the graphics hardware on my Dell G5 with an NVIDIA GTX-1050 Ti Mobile.
This article, as a supplement to Kubuntu 20.04 LTS Review, describes (and shows) the installation experience.
The Kubuntu 20.04 LTS installation experience, unlike the pre-installation experience is one of the best. The installer is straight forward, easy to use, and quick.
The only issues I faced were that:
There was a big plus however in that the graphics setup in the live environment was excellent.
Booting the live ISO brings up a GRUB menu with two options, one to start the live environment and another to start the live environment with safe graphics. When the environment starts there are two options to try Kubuntu and to install Kubuntu. I chose Try Kubuntu.
The following images show the live environment.
A launcher for the installer is conveniently placed on the desktop.
The video below shows the complete installation process I used. I had prepared partitions for the / and /home. The majority of time taken by the installation was the installation of GRUB and its probing of other partitions on the disks. I experienced the same behavior in the installation of Fedora 32 KDE Spin and have noticed it during updates of Manjaro which involve an update of GRUB taking twenty minutes for the GRUB update portion of the package update. Some timestamps of the video:
The installer is straightforward and relatively quick except during periods where GRUB related operations were active.