I am very new about MongoDB, And I want to use MongoDB 4.4 Version on Ubuntu 18.04. So I installed it.
But, some GPG error comes up when I use sudo apt-get update.
It is about 4.0 version.
Ign:2 https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 InRelease
Ign:3 https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.4 InRelease
Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Get:6 https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 Release [2,989 B]
Hit:7 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:8 https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.4 Release
Hit:10 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
Get:11 https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 Release.gpg [801 B]
Ign:11 https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 Release.gpg
Reading package lists... Done
W: GPG error: https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 Release: The following signatures were invalid: EXPKEYSIG 68818C72E52529D4 MongoDB 4.0 Release Signing Key <[email protected]>
E: The repository 'https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
I don't know why these error comes up despite i installed 4.4 version.
Here is the proof that I installed only 4.4 version.
