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Re: Docker installation problem

Thank you Georgi. That fixed the problem. I wonder how many of the other problems I have been have are due to debconf being screwed up. What tipped you off? This is not an obvious cause.


Gary R.

On 7/3/21 4:39 PM, Georgi Naplatanov wrote:
On 7/4/21 2:17 AM, Gary L. Roach wrote:
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
. I followed the instructions to the letter with the exception of
skipping over the repository setup that I installed before. I got the

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:
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/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 →
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,
  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:
E: Sub-process /usr/bin/dpkg returned an error code (1)
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

Hi Gary,

try to reconfigure debconf with following command as root:

# dpkg-reconfigure debconf

and choose "Dialog" as interface to use.

Then try to install docker again.

Kind regards

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