I use Ubuntu installed on a hard disk. My computer also comes with a tiny (16GB) SSD that I’ve another Ubuntu installation on. While a fresh install on the SSD worked great, this is too small to hold all the packages I will eventually need.

Is there any way to only have the core bits of the distro on the SSD, and have all the other packages I later install on the HDD?

I want this so I can have a fast boot (boots slowly using the HDD) and since I’m happy with the speed of apps as they work while now installed on my HDD, I’d like to keep using them off of it.

All idea welcome :)