太新的ubuntu無法安裝docker

 症狀

透過官方安裝的文件安裝docker之後，進行apt-get install docker-ce出現以下錯誤訊息:

markliou@ct-mulan:~$ sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-com  pose-plugin

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

Package docker-ce 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 'docker-ce' has no installation candidate

E: Unable to locate package docker-ce-cli

E: Unable to locate package containerd.io

E: Couldn't find any package by glob 'containerd.io'

E: Couldn't find any package by regex 'containerd.io'

E: Unable to locate package docker-buildx-plugin

E: Unable to locate package docker-compose-plugin

部分文章指出這是因為ubuntu版本太新，docker來不及製作該目錄。

但實際測試發現有些機器可以安裝，有些機器不可以。

目前看到推測是會有不明原因，某些機器透過官方給定的repo就會給定錯誤的網址(參閱解決辦法2)。

解決辦法1.

就不要透過apt-get安裝，改用snap:

sudo snap install docker

解決辦法2.

修改 /etc/apt/sources.list.d/docker.list

deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu   mantic stable

#deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian   mantic stable

把原本沒辦法用的url註解，換成上面可以用的url。

references:

https://forums.docker.com/t/cant-install-docker-on-ubuntu-20-04/93058