OK, flashed the installer to eMMC. The defaults here are a minimal install, using username and password 'odroid'.
I edited the preseed.ini on the eMMC to use my username, password and I set a full name (without using spaces). I opted for the minimal install.
Plugged in the eMMC to the C4, added keyboard, hdmi, power. It booted up the installer, then proceeded to install an (almost) fully updated Ubuntu 20.04 image on its own. Did a reboot, and done. A login prompt.
All worked perfectly fine!
I noticed there were a few updates still.
I installed ubuntu-desktop (without the wayland thing at first), using:
Worked fine as well. Took a while (I have slow internet, downloads about 750 mb) but a fully up-to-date Ubuntu desktop (Gnome 3 with ubuntu theming) got installed. A 'sudo reboot' after the installation completed and it booted into GDM3 de ubuntu login manager. I even spotted the ubuntu bootsplash during the boot. Nice, the bootup looking all fancy!!
Gnome 3 worked, all nicely themed. Not very fast / responsive.
I noticed the terminal didn't load. So fixed that, as described in the previous post
Proceeded to install the Wayland 3D GPU driver.
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sudo apt install mali-bifrost-wayland-driver
It completed its work. Did the reboot. And ... it didn't reboot.
Had to pull the power cord, plugged it back in. It booted into the GDM graphical login.
Clicked on my name (nice, that preseed.ini thing really works wonders), chose the Ubuntu Wayland session using circle-icon bottom right of screen.
It loaded to a hardware accelerated desktop, with smooth animations and all. Awesome!!
Now, still need to do the MOZ_ENABLE_WAYLAND thing to get Firefox to use Wayland. That's however normal for Firefox on Wayland.
I enabled it by adding 'export MOZ_ENABLE_WAYLAND=1' both ~/.bashrc and ~/.profile at the bottom of the file. Still have to find out which of the two I really need to edit.
Strange enough Firefox seems to have regressed a little, as it takes another second for it to slot into its Wayland frame. That is a nice new (or rather: old) Firefox bug.
Also, I could without any issues use the settings app to correct the timezone now, and the installation of languages worked correctly now.
The installer solves some configuration issues from the '20200501 - Korean Labour day Edition' image.
And you can install the Ubuntu/Gnome Software Center using:
Be aware that the Software Center now favors snap packages, which are a bit of a mixed bag.
MPV plays video quite nicely!
And QT apps (I tested Clementine) now show with the right window decoration and pretty decent theming.
First time you open it, it takes a little while to load. Not sure why.
This installer seems to be working on pure magic! Resulting in a wonderful Ubuntu 20.04 installation, with a pretty awesome Gnome 3 setup.
That's my experience, I hope my sharing it helps someone get started.