%u, %U, %g and %G have nothing to resolve to in the global scope, and failed with -EINVAL. Install code already treats -EUNATCH as "cannot resolve specifiers": it is listed in ERRNO_IS_NEG_UNIT_ISSUE() and install_change_dump_error() turns it into a proper message. With -EINVAL, "systemctl --global enable" of a unit using these specifiers only reported "Invalid argument". Return -EUNATCH instead, like the machine-id and os-release specifiers already do when their source is missing. Only the install code uses these specifiers in the global scope. (cherry picked from commit 03ce9bcff23d07751dc6911c7963e3bde9e780c2)
System and Service Manager
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