dokku: Installation on Ubuntu 20.04 (arm) fails.

Description of problem

I am trying to install dokku on a ubuntu 20.04 docker container but it fails.

Reading the release notes and https://github.com/dokku/dokku/issues/1393 it seems like aarch64 is not yet supported - but possible to add.

Adding support for other ARM architectures should be rather trivial in the future (provided there is Golang support).

What needs to happen to get support for this?

How reproducible

Run the following steps below on an arm Mac.

Steps to Reproduce

1. docker run --rm --name dokku -it ubuntu:20.04 bash
2. apt-get update
3. wget https://raw.githubusercontent.com/dokku/dokku/v0.26.6/bootstrap.sh
4. DOKKU_TAG=v0.26.6 bash bootstrap.sh

Actual Results

root@b0dbc567de62:/# DOKKU_TAG=v0.26.6 bash bootstrap.sh
Preparing to install v0.26.6 from https://github.com/dokku/dokku.git...
--> Ensuring we have the proper dependencies
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package readline-common.
(Reading database ... 4463 files and directories currently installed.)
Preparing to unpack .../0-readline-common_8.0-4_all.deb ...
Unpacking readline-common (8.0-4) ...
Selecting previously unselected package libreadline8:arm64.
Preparing to unpack .../1-libreadline8_8.0-4_arm64.deb ...
Unpacking libreadline8:arm64 (8.0-4) ...
Selecting previously unselected package libassuan0:arm64.
Preparing to unpack .../2-libassuan0_2.5.3-7ubuntu2_arm64.deb ...
Unpacking libassuan0:arm64 (2.5.3-7ubuntu2) ...
Selecting previously unselected package gpgconf.
Preparing to unpack .../3-gpgconf_2.2.19-3ubuntu2.1_arm64.deb ...
Unpacking gpgconf (2.2.19-3ubuntu2.1) ...
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Setting up libnpth0:arm64 (1.6-1) ...
Setting up libassuan0:arm64 (2.5.3-7ubuntu2) ...
Setting up readline-common (8.0-4) ...
Setting up pinentry-curses (1.1.0-3build1) ...
Setting up libreadline8:arm64 (8.0-4) ...
Setting up gpgconf (2.2.19-3ubuntu2.1) ...
Setting up gpg-agent (2.2.19-3ubuntu2.1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
debconf: delaying package configuration, since apt-utils is not installed
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Setting up libjson-c4:arm64 (0.13.1+dfsg-7ubuntu0.3) ...
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Setting up libip4tc2:arm64 (1.8.4-3ubuntu2) ...
Setting up libkmod2:arm64 (27-1ubuntu2) ...
Setting up systemd-timesyncd (245.4-4ubuntu3.13) ...
Created symlink /etc/systemd/system/dbus-org.freedesktop.timesync1.service → /lib/systemd/system/systemd-timesyncd.service.
Created symlink /etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.
Setting up systemd (245.4-4ubuntu3.13) ...
Created symlink /etc/systemd/system/getty.target.wants/getty@tty1.service → /lib/systemd/system/getty@.service.
Created symlink /etc/systemd/system/multi-user.target.wants/remote-fs.target → /lib/systemd/system/remote-fs.target.
Created symlink /etc/systemd/system/dbus-org.freedesktop.resolve1.service → /lib/systemd/system/systemd-resolved.service.
Created symlink /etc/systemd/system/multi-user.target.wants/systemd-resolved.service → /lib/systemd/system/systemd-resolved.service.
ln: failed to create symbolic link '/etc/resolv.conf': Device or resource busy
Created symlink /etc/systemd/system/multi-user.target.wants/ondemand.service → /lib/systemd/system/ondemand.service.
Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service → /lib/systemd/system/systemd-pstore.service.
Initializing machine ID from random generator.
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Setting up libkrb5support0:arm64 (1.17-6ubuntu4.1) ...
Setting up tzdata (2021e-0ubuntu0.20.04) ...

Current default time zone: 'Etc/UTC'
Local time is now:      Tue Dec 14 00:30:27 UTC 2021.
Universal Time is now:  Tue Dec 14 00:30:27 UTC 2021.
Run 'dpkg-reconfigure tzdata' if you wish to change it.

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Setting up libpam-systemd:arm64 (245.4-4ubuntu3.13) ...
Setting up libgirepository-1.0-1:arm64 (1.64.1-1~ubuntu20.04.1) ...
Setting up libkrb5-3:arm64 (1.17-6ubuntu4.1) ...
Setting up libstemmer0d:arm64 (0+svn585-2) ...
Setting up libmpdec2:arm64 (2.4.2-3) ...
Setting up glib-networking-common (2.64.2-1ubuntu0.1) ...
Setting up libpython3.8-stdlib:arm64 (3.8.10-0ubuntu1~20.04.1) ...
Setting up python3.8 (3.8.10-0ubuntu1~20.04.1) ...
Setting up libelf1:arm64 (0.176-1.1build1) ...
Setting up iso-codes (4.4-1) ...
Setting up gpg (2.2.19-3ubuntu2.1) ...
Setting up libpolkit-gobject-1-0:arm64 (0.105-26ubuntu1.1) ...
Setting up libgstreamer1.0-0:arm64 (1.16.2-2) ...
Setcap worked! gst-ptp-helper is not suid!
Setting up libpython3-stdlib:arm64 (3.8.2-0ubuntu2) ...
Setting up glib-networking-services (2.64.2-1ubuntu0.1) ...
Setting up libicu66:arm64 (66.1-2ubuntu2.1) ...
Setting up libglib2.0-bin (2.64.6-1~ubuntu20.04.4) ...
Setting up python3 (3.8.2-0ubuntu2) ...
Setting up python3-six (1.14.0-2) ...
Setting up dbus-user-session (1.12.16-2ubuntu2.1) ...
Setting up python3-certifi (2019.11.28-1) ...
Setting up libgssapi-krb5-2:arm64 (1.17-6ubuntu4.1) ...
Setting up python3-idna (2.8-1) ...
Setting up gir1.2-glib-2.0:arm64 (1.64.1-1~ubuntu20.04.1) ...
Setting up python3-urllib3 (1.25.8-2ubuntu0.1) ...
Setting up libpolkit-agent-1-0:arm64 (0.105-26ubuntu1.1) ...
Setting up lsb-release (11.1.0ubuntu2) ...
Setting up libxml2:arm64 (2.9.10+dfsg-5ubuntu0.20.04.1) ...
Setting up policykit-1 (0.105-26ubuntu1.1) ...
Setting up python3-pkg-resources (45.2.0-1) ...
Setting up python3-dbus (1.2.16-1build1) ...
Setting up python3-apt (2.0.0ubuntu0.20.04.6) ...
Setting up dconf-service (0.36.0-1) ...
Setting up gir1.2-packagekitglib-1.0 (1.1.13-2ubuntu1.1) ...
Setting up python3-chardet (3.0.4-4build1) ...
Setting up python3-gi (3.36.0-1) ...
Setting up python3-requests (2.22.0-2ubuntu1) ...
Setting up dconf-gsettings-backend:arm64 (0.36.0-1) ...
Setting up python3-requests-unixsocket (0.2.0-2) ...
Setting up python3-software-properties (0.99.9.8) ...
Setting up gsettings-desktop-schemas (3.36.0-1ubuntu1) ...
Setting up glib-networking:arm64 (2.64.2-1ubuntu0.1) ...
Setting up libsoup2.4-1:arm64 (2.70.0-1) ...
Setting up libappstream4:arm64 (0.12.10-2) ...
Setting up packagekit (1.1.13-2ubuntu1.1) ...
invoke-rc.d: could not determine current runlevel
invoke-rc.d: policy-rc.d denied execution of force-reload.
Failed to open connection to "system" message bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
Created symlink /etc/systemd/user/sockets.target.wants/pk-debconf-helper.socket → /usr/lib/systemd/user/pk-debconf-helper.socket.
Setting up software-properties-common (0.99.9.8) ...
Processing triggers for systemd (245.4-4ubuntu3.13) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
Processing triggers for dbus (1.12.16-2ubuntu2.1) ...
--> Note: Installing dokku for the first time will result in removal of
    files in the nginx 'sites-enabled' directory. Please manually
    restore any files that may be removed after the installation and
    web setup is complete.

    Installation will continue in 10 seconds.
--> Initial apt-get update
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package apt-transport-https.
(Reading database ... 10149 files and directories currently installed.)
Preparing to unpack .../apt-transport-https_2.0.6_all.deb ...
Unpacking apt-transport-https (2.0.6) ...
Setting up apt-transport-https (2.0.6) ...
--> Installing docker
2021-12-14 00:30:41 URL:https://get.docker.com/ [18617/18617] -> "-" [1]
# Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be
+ sh -c apt-get update -qq >/dev/null
+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null
debconf: delaying package configuration, since apt-utils is not installed
+ sh -c curl -fsSL "https://download.docker.com/linux/ubuntu/gpg" | gpg --dearmor --yes -o /usr/share/keyrings/docker-archive-keyring.gpg
+ sh -c echo "deb [arch=arm64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu focal stable" > /etc/apt/sources.list.d/docker.list
+ sh -c apt-get update -qq >/dev/null
+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends  docker-ce-cli docker-ce >/dev/null
debconf: delaying package configuration, since apt-utils is not installed
+ version_gte 20.10
+ [ -z  ]
+ return 0
+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq docker-ce-rootless-extras >/dev/null
debconf: delaying package configuration, since apt-utils is not installed

================================================================================

To run Docker as a non-privileged user, consider setting up the
Docker daemon in rootless mode for your user:

    dockerd-rootless-setuptool.sh install

Visit https://docs.docker.com/go/rootless/ to learn about rootless mode.


To run the Docker daemon as a fully privileged service, but granting non-root
users access, refer to https://docs.docker.com/go/daemon-access/

WARNING: Access to the remote API on a privileged Docker daemon is equivalent
         to root access on the host. Refer to the 'Docker daemon attack surface'
         documentation for details: https://docs.docker.com/go/attack-surface/

================================================================================

--> Installing dokku
2021-12-14 00:31:03 URL:https://d28dx6y1hfq314.cloudfront.net/505/623/gpg/dokku-dokku-FB2B6AA421CD193F.pub.gpg?t=1639442162_cd842a2c736729417ac08ba40a64e107575a2744 [3937/3937] -> "-" [1]
OK
deb https://packagecloud.io/dokku/dokku/ubuntu/ focal main
E: Unable to locate package dokku

Expected Results

The install should succeed.

Environment Information

Docker version 20.10.11, build dea9396 running on macOS 12.0.1 (arm) Linux 7d00cbdabb81 5.10.76-linuxkit #1 SMP PREEMPT Mon Nov 8 11:22:26 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux as container.

dokku report APP_NAME output

There is no dokku yet.

How (deb/make/rpm) and where (AWS, VirtualBox, physical, etc.) was Dokku installed?

Installing inside a docker container.