Couldnt open style file usr/share/default.style No such file / drectry

Hi,
I’m Trying to do a tile server setup folowing the below URL :
https://switch2osm.org/serving-tiles/building-a-tile-server-from-packages/

I have already installed postgresql and also down loaded a country .pbf file.

But when i’m doing :

osm2pgsql --slim -C 1500 --number-processes 4 my_country.osm.pbf

i’m getting the error :

Can any one help me fixing the issue ?