EXPKEYSIG debian ubuntu fedora

Fix EXPKEYSIG 9DC858229FC7DD38

Docker CE <docker@docker.com> — by Docker Inc.

Official Key Page: https://docs.docker.com/engine/install/
Error message 
EXPKEYSIG 9DC858229FC7DD38 Docker CE <docker@docker.com>

Your distro

Fix commands for Generic (GnuPG)

Method 1 GnuPG keyserver lookup

Fetches the key from a public keyserver using GnuPG. Works on any distro with gpg installed.

Generic (GnuPG) — bash
$ gpg --keyserver keyserver.ubuntu.com --recv-keys 9DC858229FC7DD38
$ gpg --list-keys 9DC858229FC7DD38
Official documentation

Method 2 Direct download

Downloads and imports the key file directly from the vendor.

Generic (GnuPG) — bash
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --import
Official documentation

After importing the key

Run sudo apt-get update (or your distro's equivalent) again. If successful you should see Hit: lines with no EXPKEYSIG warnings. Still broken? Check that your /etc/apt/sources.list.d/ entry references the correct [signed-by=…] keyring path.