When attaching and /etc/systemd/system.attached can't be created or used (eg: dead symlink) the logs are pretty much useless as even at debug level there's no indication of what is going wrong. Add some debug logs, and return a more specific error string over D-Bus. (cherry picked from commit 80d95fcd6e1947a7887b96b22a32dbca115baac9) (cherry picked from commit 79f161ac6523991f038dae8c7fc5298cad675a96)
System and Service Manager
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