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 Fedora

Method 1 Import from official URL

Imports the GPG key directly from the vendor and refreshes the package cache.

Fedora — bash
$ sudo rpm --import https://download.docker.com/linux/ubuntu/gpg
$ sudo dnf check-update
Official documentation

Method 2 Import from keyserver via GnuPG

Fetches the key from a public keyserver, exports it in ASCII armor format, then imports into the RPM database.

Fedora — bash
$ gpg --keyserver hkps://keys.openpgp.org --recv-keys 9DC858229FC7DD38
$ gpg --export --armor 9DC858229FC7DD38 | sudo rpm --import -
$ sudo dnf check-update

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.