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DockerHubへのdocker loginが出来なかった場合の対処

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現象

DockerHubにimageをpushしたいのに docker login が出来ませんでした。ログとしては以下のような形。Ubuntu18.04へteratermでログインし実行したコマンドログです。

$ sudo docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: XXXXXXX
Password:
Error saving credentials: error storing credentials - err: exit status 1, out: `Cannot autolaunch D-Bus without X11 $DISPLAY`

ssh経由での操作が影響してたりするかな?と思い直にコマンドを打つと今度は"Timeout was reached"というエラーに変わっていました。うーむ

対処

Dockerのissue経由で以下stackverflowに行きつき解決。

**gnupg2, pass**という2つのパッケージが必要でした。

sudo apt install gnupg2 pass

上記をインストールすると無事解決。docker pushも実行することが出来ました。

$ sudo docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: XXXXXXX
Password:
WARNING! Your password will be stored unencrypted in /home/htsuji/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

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