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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1820575 Title: i386 VMs abort with NS_ERROR_FAILURE (0x80004005) after upgrading host to disco To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1820575/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs