getopts checking for mutually exclusive arguments
I can think of 2 ways:
Accept an option like -t <argument> Where argument can be desktop or minimal
So your script will be called as:
./scriptname.sh -t desktop -nOR
./scriptname.sh -t minimal -nAnother alternative is to enforce validation inside your script as this:
headless=buildtype=while getopts 'mdnh' flag; do case "$flag" in m) [ -n "$buildtype" ] && usage || buildtype='minimal' ;; d) [ -n "$buildtype" ] && usage || buildtype='desktop' ;; n) headless=1 ;; h) usage ;; \?) usage ;; *) usage ;; esacdone