[DiapDealer]

Yes. The launcher root is expected (on Linux) to be found in the /share directory adjacent to the directory the Sigil binary is in. This will work "as is" if Sigil is installed to either of the "typical" /usr or /usr/local prefixes. If you relocate the binary (as I've done in my binary packages)--or the entire installation--to somewhere where that the typical ./bin ./share structure doesn't exist, then it will be necessary to set the launcher root directory manually via the SIGIL_PLUGIN_LAUNCHERS environment variable (either in your bash profile or the Sigil launch script).

I jump through the hoops I do with my binary package so that the Sigil.desktop file (/usr/local/share/applications) still functions as expected with regard to the various Linux Desktop Environments, their menus, and the "open with" context menus. Rather than launching from a terminal, the application launcher from the menu system can be easily copied to the desktop.