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"umount:ecryptfs: Failed to find key with sig" on shutdown; why?

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Every time I shut my system down it seems to be unable to umount ecryptfs volumes correctly. Why it may happen? What should I check to debug this problem?

Oct 19 23:46:39 hebel umount.ecryptfs[15033]: Failed to find key with sig [2a8bfafa7697bcab]: Required key not available
Oct 19 23:46:39 hebel umount.ecryptfs[15031]: Failed to find key with sig [b227bd91c1e58ad1]: Required key not available
Oct 19 23:46:39 hebel umount.ecryptfs[15033]: Failed to find key with sig [de065968e7f116d5]: Required key not available
Oct 19 23:46:39 hebel umount.ecryptfs[15031]: Failed to find key with sig [f974d4dd70377cd6]: Required key not available
Oct 19 23:46:39 hebel systemd[1]: Shutting down.
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