package groff-1.18.1-20 (which is newer than groff-1.18-6) is already installed
file /usr/bin/addftinfo from install of groff-1.18-6 conflicts with file from package groff-1.18.1-20
file /usr/bin/eqn from install of groff-1.18-6 conflicts with file from package groff-1.18.1-20
file /usr/bin/eqn2graph from install of groff-1.18-6 conflicts with file from package groff-1.18.1-20
file /usr/bin/grn from install of groff-1.18-6 conflicts with file from package groff-1.18.1-20
file /usr/bin/grodvi from install of groff-1.18-6 conflicts with file from package groff-1.18.1-20
file /usr/bin/groff from install of groff-1.18-6 conflicts with file from package groff-1.18.1-20