Docker のアップグレード時期と方法（いつ、どうやって？）

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OK, followed the instructions and it all went smoothly. The most time consuming part by far was taking a snapshot beforehand as a safety precaution (on top of normal backups and such).

docker info now reports:

Server Version: 18.06.0-ce
Storage Driver: aufs

I include the aufs since the update Get Docker page says:

For Ubuntu 16.04 and higher, the Linux kernel includes support for OverlayFS, and Docker CE uses the overlay2 storage driver by default. If you need to use aufs instead, you need to configure it manually. See aufs

But it seems that the update did not transition to using overlay instead of aufs.

Do I need to do something to make that happen as well, or just ignore it and continue with aufs?

Thanks!