package docker.io 1.13.1-0ubuntu1~16.04.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Prasanjit Dandapat]

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  bridge-utils cgroupfs-mount containerd git git-man liberror-perl runc
  ubuntu-fan
Suggested packages:
  aufs-tools btrfs-tools debootstrap docker-doc rinse zfs-fuse | zfsutils
  git-daemon-run | git-daemon-sysvinit git-doc git-el git-email git-gui gitk
  gitweb git-arch git-cvs git-mediawiki git-svn
The following NEW packages will be installed:
  bridge-utils cgroupfs-mount containerd docker.io git git-man liberror-perl
  runc ubuntu-fan
0 upgraded, 9 newly installed, 0 to remove and 463 not upgraded.
Need to get 21.4 MB of archives.
After this operation, 116 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 bridge-utils amd64 1.5-9ubuntu1 [28.6 kB]
Get:2 http://in.archive.ubuntu.com/ubuntu xenial/universe amd64 cgroupfs-mount all 1.2 [4,970 B]
Get:3 http://in.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 runc amd64 1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1 [1,488 kB]
Get:4 http://in.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 containerd amd64 0.2.5-0ubuntu1~16.04.1 [4,041 kB]
Get:5 http://in.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 docker.io amd64 1.13.1-0ubuntu1~16.04.2 [11.9 MB]
Get:6 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 liberror-perl all 0.17-1.2 [19.6 kB]
Get:7 http://in.archive.ubuntu.com/ubuntu xenial-updates/main amd64 git-man all 1:2.7.4-0ubuntu1.3 [736 kB]
Get:8 http://in.archive.ubuntu.com/ubuntu xenial-updates/main amd64 git amd64 1:2.7.4-0ubuntu1.3 [3,102 kB]
Get:9 http://in.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ubuntu-fan all 0.12.8~16.04.2 [35.6 kB]
Fetched 21.4 MB in 1min 3s (335 kB/s)
Selecting previously unselected package bridge-utils.
(Reading database ... 177103 files and directories currently installed.)
Preparing to unpack .../bridge-utils_1.5-9ubuntu1_amd64.deb ...
Unpacking bridge-utils (1.5-9ubuntu1) ...
Selecting previously unselected package cgroupfs-mount.
Preparing to unpack .../cgroupfs-mount_1.2_all.deb ...
Unpacking cgroupfs-mount (1.2) ...
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Preparing to unpack .../runc_1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1_amd64.deb ...
Unpacking runc (1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1) ...
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Preparing to unpack .../containerd_0.2.5-0ubuntu1~16.04.1_amd64.deb ...
Unpacking containerd (0.2.5-0ubuntu1~16.04.1) ...
Selecting previously unselected package docker.io.
Preparing to unpack .../docker.io_1.13.1-0ubuntu1~16.04.2_amd64.deb ...
Unpacking docker.io (1.13.1-0ubuntu1~16.04.2) ...
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Preparing to unpack .../ubuntu-fan_0.12.8~16.04.2_all.deb ...
Unpacking ubuntu-fan (0.12.8~16.04.2) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for ureadahead (0.100.0-19) ...
ureadahead will be reprofiled on next reboot
Processing triggers for systemd (229-4ubuntu16) ...
Setting up bridge-utils (1.5-9ubuntu1) ...
Setting up cgroupfs-mount (1.2) ...
Setting up runc (1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1) ...
Setting up containerd (0.2.5-0ubuntu1~16.04.1) ...
Setting up docker.io (1.13.1-0ubuntu1~16.04.2) ...
addgroup: The group `docker' already exists and is not a system group. Exiting.
dpkg: error processing package docker.io (--configure):
 subprocess installed post-installation script returned error exit status 1
Setting up liberror-perl (0.17-1.2) ...
Setting up git-man (1:2.7.4-0ubuntu1.3) ...
Setting up git (1:2.7.4-0ubuntu1.3) ...
Setting up ubuntu-fan (0.12.8~16.04.2) ...
Processing triggers for systemd (229-4ubuntu16) ...
Processing triggers for ureadahead (0.100.0-19) ...
Errors were encountered while processing:
 docker.io
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: docker.io 1.13.1-0ubuntu1~16.04.2
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Tue Feb 13 18:38:43 2018
DuplicateSignature:
 package:docker.io:1.13.1-0ubuntu1~16.04.2
 Setting up docker.io (1.13.1-0ubuntu1~16.04.2) ...
 addgroup: The group `docker' already exists and is not a system group. Exiting.
 dpkg: error processing package docker.io (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2018-02-10 (2 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: docker.io
Title: package docker.io 1.13.1-0ubuntu1~16.04.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Joshua Powers (powersj)]

Thanks for taking the time to file a bug!

The issue looks to be:

addgroup: The group `docker' already exists and is not a system group. Exiting.

If you type 'apt install -f' the install should complete just fine.

[Launchpad Janitor (janitor)]

[Expired for docker.io (Ubuntu) because there has been no activity for 60 days.]