recently started happening in Mythbuntu 14.04
Found smb.conf had an invalid security setting "security = share". I know I had changed it, but I didn't comment why. Setting "security = user" and adding "map to guest = Bad User" allowed system-config-samba to launch normally.
More info here: http://ubuntuforums.org/showthread.php?t=1962617
recently started happening in Mythbuntu 14.04
Found smb.conf had an invalid security setting "security = share". I know I had changed it, but I didn't comment why. Setting "security = user" and adding "map to guest = Bad User" allowed system-config-samba to launch normally.
More info here: http:// ubuntuforums. org/showthread. php?t=1962617