Docker installation problem

["Gary L. Roach" <garyroach719@gmail.com>]

Hi all,

Operating System: Debian GNU/Linux 10
KDE Plasma Version: 5.14.5
Qt Version: 5.11.3
KDE Frameworks Version: 5.54.0
Kernel Version: 4.19.0-17-amd64
OS Type: 64-bit
Processors: 4 × AMD FX(tm)-4350 Quad-Core Processor
Memory: 15.6 GiB of RAM

I have been trying to get a working installation of Docker. This should be easy considering all of the information available. Alas, for me, this doesn't seem to be the case. My latest attempt was to use the instructions at https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-debian-10 . I followed the instructions to the letter with the exception of skipping over the repository setup that I installed before. I got the following:

> apt install docker-ce
>         Reading package lists... Done
>         Building dependency tree       
>         Reading state information... Done
>         The following additional packages will be installed:
>           docker-ce-cli docker-ce-rootless-extras docker-scan-plugin
>         Recommended packages:
>           slirp4netns
>         The following NEW packages will be installed:
>           docker-ce docker-ce-cli docker-ce-rootless-extras
>         docker-scan-plugin
>         0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
>         Need to get 0 B/79.1 MB of archives.
>         After this operation, 335 MB of additional disk space will be
>         used.
>         Do you want to continue? [Y/n] 
>         qt.qpa.screen: QXcbConnection: Could not connect to display 
>         Could not connect to any X display.
>         debconf: unable to initialize frontend: Kde
>         debconf: (debconf-kde-helper terminated abnormally (exit status:
>         1))
>         debconf: falling back to frontend: Qt
>         debconf: unable to initialize frontend: Qt
>         debconf: (Can't locate Debconf/FrontEnd/Qt.pm in @INC (you may
>         need to install the Debconf::FrontEnd::Qt module) (@INC
>         contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.28.1
>         /usr/local/share/perl/5.28.1
>         /usr/lib/x86_64-linux-gnu/perl5/5.28 /usr/share/perl5
>         /usr/lib/x86_64-linux-gnu/perl/5.28 /usr/share/perl/5.28
>         /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at
>         (eval 22) line 2.)
>         debconf: falling back to frontend: Dialog
>         Selecting previously unselected package docker-ce-cli.
>         (Reading database ... 263049 files and directories currently
>         installed.)
>         Preparing to unpack
>         .../docker-ce-cli_5%3a20.10.7~3-0~debian-buster_amd64.deb ...
>         Unpacking docker-ce-cli (5:20.10.7~3-0~debian-buster) ...
>         Selecting previously unselected package docker-ce.
>         Preparing to unpack
>         .../docker-ce_5%3a20.10.7~3-0~debian-buster_amd64.deb ...
>         Unpacking docker-ce (5:20.10.7~3-0~debian-buster) ...
>         Selecting previously unselected package
>         docker-ce-rootless-extras.
>         Preparing to unpack
>         .../docker-ce-rootless-extras_5%3a20.10.7~3-0~debian-buster_amd64.deb
>         ...
>         Unpacking docker-ce-rootless-extras
>         (5:20.10.7~3-0~debian-buster) ...
>         Selecting previously unselected package docker-scan-plugin.
>         Preparing to unpack
>         .../docker-scan-plugin_0.8.0~debian-buster_amd64.deb ...
>         Unpacking docker-scan-plugin (0.8.0~debian-buster) ...
>         Setting up docker-scan-plugin (0.8.0~debian-buster) ...
>         Setting up docker-ce-cli (5:20.10.7~3-0~debian-buster) ...
>         Setting up docker-ce-rootless-extras
>         (5:20.10.7~3-0~debian-buster) ...
>         Setting up docker-ce (5:20.10.7~3-0~debian-buster) ...Could not
>         connect to any X display.
>         Created symlink
>         /etc/systemd/system/multi-user.target.wants/docker.service →
>         /lib/systemd/system/docker.service.
>         Created symlink
>         /etc/systemd/system/sockets.target.wants/docker.socket →
>         /lib/systemd/system/docker.socket.
>         Job for docker.service failed because the control process exited
>         with error code.
>         See "systemctl status docker.service" and "journalctl -xe" for
>         details.Could not connect to any X display.
>         invoke-rc.d: initscript docker, action "start" failed.
>         ● docker.service - Docker Application Container Engine
>            Loaded: loaded (/lib/systemd/system/docker.service; enabled;
>         vendor preset: enabled)
>            Active: activating (auto-restart) (Result: exit-code) since
>         Sat 2021-07-03 15:54:00 PDT; 9ms ago
>              Docs: https://docs.docker.com
>           Process: 28141 ExecStart=/usr/bin/dockerd -H fd://
>         --containerd=/run/containerd/containerd.sock (code=exited,
>         status=1/FAILURE)
>          Main PID: 28141 (code=exited, status=1/FAILURE)
>         dpkg: error processing package docker-ce (--configure):
>          installed docker-ce package post-installation script subprocess
>         returned error exit status 1
>         Processing triggers for man-db (2.8.5-2) ...
>         Processing triggers for systemd (241-7~deb10u7) ...
>         Errors were encountered while processing:
>          docker-ce
>         E: Sub-process /usr/bin/dpkg returned an error code (1)
>         root@debian:/var/run/docker#
> https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-debian-10https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-debian-10https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-debian-10https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-debian-10
>       
      Note the error at docker.service and the "Could not connect to
        any X display" problem. I'm not sure what to do to fix this.
      Any help will be appreciated.

Gary R.