gnome-user-share doesn't work here at all, and after doing some strace I'm sort-of seeing why. It tries to launch it like so: [pid 21788] execve("/usr/sbin/httpd", ["/usr/sbin/httpd", "-f", "/usr/share/gnome-user-share/dav_"..., "-C", "Listen -1"], [/* 7 vars */] <unfinished ...> which results in: [pid 21788] write(2, "Syntax error on line 1 of -c/-C "..., 44) = 44 [pid 21788] write(2, "Port must be specified\n", 23) = 23 Which makes sense, as -1 is not a legal value (as far as the docs go at least). No clue as to why it does this.
Ok, looked at the code. The -1 is an error code indicating that it failed to find a random port (error checking, guys? ;)). As to why that fails, strace shows: socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 17 setsockopt(17, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 bind(17, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = -1 EINVAL (Invalid argument) I'm guessing teh lack of proper address family is what it gets upset about. The man page even says that this is expected: "sin_family is always set to AF_INET. This is required; in Linux 2.2 most networking functions return EINVAL when this setting is missing. " How did this ever work?
See also <https://bugs.launchpad.net/ubuntu/+source/gnome-user-share/+bug/856732>. That is this same bug as represented in Ubuntu's bug tracker, and it includes a suggested patch. (I'd add this link to the "External Trackers" section of this report, but it seems I do not have permission to do so.)
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