Hi Philip,

Refer the following blog for your additional question https://www.cybrosys.com/blog/install-odoo-13-on-ubuntu-18-04

This worked,

If you want to install multiple modules in the command line in one time you can just separate the module name by comma, e.g:

./odoo-bin -c debian/odoo.conf -d odoo_test_database -r odoo_postgre_user -w odoo_postgre_user_password -i custom_module1,custom_module2,custom_module3

Hope that useful : )

Thanks,
Tri