Full disclosure I totally screwed up and downloaded the 32bit iso image for debian.
Went back and retraced my steps and downloaded the x64 debian iso and all is well with the world.
Apologies and thanks for all the help. I feel like a real moron right now.
Don’t worry mate - we have all been there done that. Great learning experience though!
You learn far more from your mistakes than your successes. I’ve learned a lot over the years 
Hey Guys,
I am struggling to install docker on my QNAP NAS. I installed Debian 10.9 and no matter what I do I got the following error:
E: Package ‘docker-ce’ has no installation candidate
Any suggestions?
See my error a few posts up, sounds similar. Of cpu isn’t 64 bit capable or U are loading 32 bit debian you will definitely get his error.
You might be better off looking at a QNAP guide.
I see there is a Docker update to 5.20.10.6.3 version (debian buster arm64 here). After the recent problems with all Docker updates I’m a little bit hesitant to upgrade. Has anyone done that?
no problems here with 6.3…home assistant with several supervisor addons, portainer, pihole, mealie containers running fine.
Have you rebooted the host?
docker version:
Client: Docker Engine - Community
Version: 20.10.6
API version: 1.41
Go version: go1.13.15
Git commit: 370c289
Built: Fri Apr 9 22:46:45 2021
OS/Arch: linux/amd64
Context: default
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.6
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: 8728dd2
Built: Fri Apr 9 22:44:56 2021
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.4.4
GitCommit: 05f951a3781f4f2c1911b05e61c160e9c30eaa8e
runc:
Version: 1.0.0-rc93
GitCommit: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
docker-init:
Version: 0.19.0
GitCommit: de40ad0
Of course, just because the update acted transparently for me, doesn’t mean that you’ll have the same experience. If you are a bleeding edge person like me, update…if not, wait a few days.
Just updated and rebooted, everything’s working fine.
Followed the instructions with this result:
...
[info] Install supervisor Docker container
invalid reference format
How can this be fixed
What machine are you using?
Nevermind, I went to Virtualbox as it is meant to be an installation for testing purposes only.
Back in December (the 20th!) I successfully (with the help of people here!) installed this. It’s been working fine ever since.
HAS there been a Debian update since then?
DO I need to update Debian if there has been?
And if I do - is there a nice walkthrough guide like the initial installation process?
@withay The first commands you will enter, are all about upgrading the OS to latest stable.
They are valid even after the installation has completed.
if it working dont change it…
Oh, so it won’t wipe out my HA install?
Well, I was wondering about security updates, that kind of thing.
just do this apt-get update && apt-get dist-upgrade -y && apt autoremove -y