5210R: ISO image updated (AlmaLinux 8.8)

With the new release of the AlmaLinux 8.8 ISO image we also revised our ISO building procedure a little and published a new installation image for BlueOnyx 5210R based on the AlmaLinux 8.8 ISO image.

If you already have a BlueOnyx 5210R running, a YUM update will get you fully current and the latest set of updates seem to be entirely unproblematic.