Comment # 23 on bug 76273 from
Looks like Ubuntu Saucy needs XDG_RUNTIME_DIR (see set.

This is part of the normal user session setup and needs to be duplicated
manually when starting a custom D-Bus session.

For now, you can do:
export XDG_RUNTIME_DIR=`mktemp -d`
before invoking The directory can be removed when the session

Eventually I'll probably have to add that to I wonder whether
that explains some of the random problems that I have seen with parallel
testing on Saucy and Ubuntu: multiple different D-Bus sessions probably ended
up using the same /run/user dir.

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