Wow, thanks Patrick for the quick reply – and let me take the opportunity to thank you in person for Whonix!! <3
By the way, I failed to mention earlier but I’m on 15.0.0.3.3 (though I do run whonixcheck regularly and do what it says to do 
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So, the file is indeed not there:
ls: cannot access '/etc/apparmor.d/usr.lib.security-misc.permission-lockdown': No such file or directory
I tried to reinstall apparmor and got this:
user@host:~$ sudo apt install --reinstall -o Dpkg::Options::="--force-confask,confnew,confmiss" apparmor-profile-anondist
[sudo] password for user:
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
Okay, so I tried that – and it hangs the VM. After a few seconds, it no longer response to keyboard/mouse/window size change/etc. VirtualBox thinks it’s fine – status monitor shows 30-40% CPU – but it’s been doing that for a few hours now (see attached)
I’m wondering if the VBox upgrade went wonky on this VM (for who-knows-what reason)
It strikes me that this is just Gateway, after all – what do you think about just blowing away this VM (keeping the Workstation, natch) and reinstall it from Whonix-XFCE-15.0.0.3.3.ova ?
I had a look around the Docs section and didn’t find any warnings against (nor suggested procedures for doing so)
Repro case would be hard. I almost bet it can’t be. Shame on me for not snapshotting my VMs before upgrading VB 
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