Hello, did you try to shutdown and save again?
from 5.x to 6.x the saved store format has changed, this is an incompatible 
change that is making the restore fail on some cases (it has been fixed in 
6.0.4, but maybe there are a few more cases)

** Changed in: virtualbox (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1820575

Title:
  i386 VMs abort with NS_ERROR_FAILURE (0x80004005) after upgrading host
  to disco

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