Add package install information for Ubuntu

Tested on a clean ubuntu system.

libboost-random-dev was discovered at compile time, not at configure time
`libgdal-dev` depends on `libgdal1h`. `gdal-bin` isn't installed, but depends on `libgdal1h` too.

`libgdal1h` depends on the non-dev versions of libarmadillo, etc.