When I do sudo apt-get update I get the following error:
Err:23 https://download.docker.com/linux/ubuntu serena/stable amd64 Packages 404 Not Found E: Failed to fetch https://download.docker.com/linux/ubuntu/dists/serena/stable/binary-amd64/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead.
I know there is a similar question here
but still I am not able to solve the problem. I am running on
Distributor ID: LinuxMint
Description: Linux Mint 18.1 Serena
Release: 18.1
and the file /etc/apt/sources.list which seems to be important contains the line
#deb cdrom:[Linux Mint 18.1 _Serena_ - Release amd64 20161213]/ xenial contrib main non-free
Any help is very much appreciated.
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Answer
You are trying to update from a Mint release (Serena). If you look at https://download.docker.com/linux/ubuntu/dists/, you will see that it only supports the standard Ubuntu releases.
As we can see here, Serena is based on Xenial, so I think your best best is to change the relevant sources.list line and change serena to xenial (which isn’t the line you’ve given us, btw)
For instance, I have deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable. If you can’t find the line in /etc/apt/sources/list, it could be in a file in /etc/apt/sources.list.d