[all variants] Samba insanity: configuration artifacts, testparm disagreeing with net usershare, etc

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http://ubuntuforums.org – For the last 3 years or so I've been struggling with a particular Samba share. It *should* be simple- just a read-only guest share- but it is not. It started when I decided I'd like to share my ~/Music directory over the local network. I right-clicked the icon in Nautilus, selected "sharing options", and set up a share with read-only access, accessible to everyone. Easy peasy, except that it didn't work. Other machines on the network could see the share, but weren't permitted to access it. After perusing the forums and checking out lots of confusing documentation (I'm not exactly (Hardware)