Further to my disappearing /var/run/utmp query, I also newly can't start VMs 
with virt-manager without first doing

$ sudo modprobe tun

This has also changed recently, apparently without intervention on my part.

Presumably it has stopped being autoloaded somewhere.

Should tun be in 

/etc/modules-load.d/modules.conf

or is there an on-demand approach which seems to have been corrupted?

Thanks,
Gareth

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