I can't install Docker because containerd.io has no installation candidate

Question

I tried to install Docker on Kubuntu 19.10.

I used these steps to install: https://docs.docker.com/install/linux/docker-ce/ubuntu/

During step 2, after added repository and key I got this message

Package containerd.io is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'containerd.io' has no installation candidate

Answer 1

It's not the cleanest way to do it I guess, but I had the same problem as you and I changed:

$ sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

to

$ sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   bionic \
   stable"

because

$(lsb_release -cs)

returns "eoan" (the name of the latest ubuntu version, currently 19.10) and it seems to cause problems. Replacing this with "bionic" (ubuntu 18.10) worked perfectly for me, and I still have no problems 4 months later.

Don't forget to open "/etc/apt/sources.list" and comment-out/delete the line:

deb-src [arch=amd64] https://download.docker.com/linux/ubuntu eoan stable

to avoid conflicts. (You added this with the first command you entered in this process.)

Answer 2

Edit the file : /etc/apt/sources.list

Look for repo entry :

deb-src [arch=amd64] https://download.docker.com/linux/ubuntu eoan stable

Changing it to:

deb-src [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable 

resolved the issue for me