Can I install Ubuntu so that most accessed files reside on SSD 2GB (old Ausus eee 2Gb) and remainder of files reside on large SD card in card slot?
Well, the Ubuntu Desktop System requirements say that you need 5GB of disk space. But they also mention that hard drive memory issues can be resolved by using a Live System. If you want to do that you might want to try a Persistent Live USB installation. But here's the catch: Such a system uses a lot of RAM. So, checking your RAM capacities is probably a good idea.