I’m posting this information for a double purposes:
- To try to help future Docker`s users in Ubuntu 20
- To try to get some explanation
I got a problem during Docker installation (in particular with docker-ce installation) into an Ubuntu 20 server. There were no more libraries nor programs installed on the server (only Ubuntu 20 clean installation).
Bellow can be found more SO details:
$> lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal
$> uname -a Linux egnos-next-tb-vm1 5.4.0-81-generic #91-Ubuntu SMP Thu Jul 15 19:09:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
I followed the official documentation (Install Docker Engine on Ubuntu | Docker Documentation) but I got this error when trying to install docker-ce. Here it is the whole error trace:
$> sudo -E apt-get install docker-ce docker-ce-cli containerd.io Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: aufs-tools cgroupfs-mount | cgroup-lite The following NEW packages will be installed: containerd.io docker-ce docker-ce-cli 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/84.8 MB of archives. After this operation, 371 MB of additional disk space will be used. Selecting previously unselected package containerd.io. (Reading database ... 108311 files and directories currently installed.) Preparing to unpack .../containerd.io_1.4.9-1_amd64.deb ... Unpacking containerd.io (1.4.9-1) ... Selecting previously unselected package docker-ce-cli. Preparing to unpack .../docker-ce-cli_5%3a20.10.8~3-0~ubuntu-focal_amd64.deb ... Unpacking docker-ce-cli (5:20.10.8~3-0~ubuntu-focal) ... Selecting previously unselected package docker-ce. Preparing to unpack .../docker-ce_5%3a20.10.8~3-0~ubuntu-focal_amd64.deb ... Unpacking docker-ce (5:20.10.8~3-0~ubuntu-focal) ... Setting up containerd.io (1.4.9-1) ... Created symlink /etc/systemd/system/multi-user.target.wants/containerd.service → /lib/systemd/system/containerd.service. Setting up docker-ce-cli (5:20.10.8~3-0~ubuntu-focal) ... Setting up docker-ce (5:20.10.8~3-0~ubuntu-focal) ... groupadd: Can't get unique GID (no more available GIDs) dpkg: error processing package docker-ce (--configure): installed docker-ce package post-installation script subprocess returned error exit status 4 Processing triggers for man-db (2.9.1-1) ... Processing triggers for systemd (245.4-4ubuntu3.11) ... Errors were encountered while processing: docker-ce E: Sub-process /usr/bin/dpkg returned an error code (1)
Apparently the problem is wen trying to create the docker group (groupadd: Can’t get unique GID (no more available GIDs))
I was able to solve the problem by editing the file /etc/login.defs and setting the SYS_GID_MIN and SYS_GID_MAX parameters as follow:
SYS_GID_MIN 2000 SYS_GID_MAX 9000
Previous values were 100 and 999.
Within the same network I have other severs with Ubuntu 18.04.4 LTS (4.15.0-154-generic) and I had no problems to install Ubuntu (just following the same official documentation).
Does anyone have an explanation?
Thank you very much!