Normally, I like having 2 or 3 partitions for Linux. A system partition and a user partition (mounted at /home) and maybe a swap partition. But 16GB can be tight for a multi-partition setup.
On my 1012 with a 16GB
SSD, I went with a single 12GB partition. I left the rest unused in the hope that reserving some space will reduce
SSD performance degradation over time.
I also have the future option of changing the free space into swap, or growing the 12GB partition if needed. But my 1012 has 2GB of RAM and I don't hibernate, so I don't need swap. And I don't keep large media files on the
SSD, so 12GB is plenty.
When you install your new RAM, the BIOS might state: "System config changed" or something, but Ubuntu won't care. I would run a memtest from the Ubuntu boot menu before booting into Ubuntu, though. Make sure that the new RAM works 100%.
I hope you enjoy your Mini 9
