Looking at the core snap currently it doesn't set USE_EXTRAUSERS=1 (that line is near the bottom of the configuration file and is commented out). I wonder if this is still an issue, perhaps some other layer was adjusted to make this the default (since the core snap has a few custom packages).
Looking at the core snap currently it doesn't set USE_EXTRAUSERS=1 (that line is near the bottom of the configuration file and is commented out). I wonder if this is still an issue, perhaps some other layer was adjusted to make this the default (since the core snap has a few custom packages).