Tried to rebuild plymouth with tracing and got a bit more information.
Looks like it is "session->pseudoterminal_master_fd = posix_openpt
(O_RDWR | O_NOCTTY);" that fails in open_pseudoterminal function. The
statement returns -1 and errno is set to "No such file or directory".
The strange thing is that /dev/ptmx exists. Maybe it is due to some
permission issues?

Hope above can help someone to nail down this bug.

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Plythouth doesn't start with --attach-to-session
https://bugs.launchpad.net/bugs/502494
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