User-sysmaint-split not installed after update | qubes passwordless root is still installed

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Mostly identical. Not fully identical.

Known relevant differences are pointed out in documentation.

Quote Whonix 17.3.9.9 - Point Release!

That should say Build Version.

You’re not on build version 17.3.9.9.

For older versions, upgrades refer to Whonix wiki, sysmaint wiki page, chapter, Version Overview, column:

Old Versions