Re: Really small systems
I've not put 18.04 on any of my machines yet, but I do have a casual use system in the bedroom that runs 16.04 that is a Acer dual core Atom Netbook clocked at about 1.6GHz with 1GB of memory and 8GB SSD, although the SSD is abysmally slow, so I run it off of a normal install on a 32GB USB micro memory card reader (not a live distro).
It works OK for browsing and YouTube videos, but I would not want to use it for anything serious. And Firefox's lax memory management means that it is necessary to stop and start Firefox on a relatively regular basis. I can't believe how frequently Firefox just grows to consume all the available memory, regardless of how much you have (it's driven my normal 8GB CoreDuo Thinkpad into paging more times than I care to remember).
I'd like to run the Netbook off an SD card in the MMC slot, but the BIOS does not support booting from that device, and I've not (yet) managed to get the boot partition on the SSD to successfully boot the kernel from the MMC (it's something to do with the modules loaded into the GRUB image - I'll get there).