dev@docker:~$ sudo apt-get update
Sorry, new users can only put 2 links in a post.
Fetched 102 kB in 0s (241 kB/s)
Reading package lists… Done
W: The repository ‘apt.dockerproject.org/repo/pool xenial Release’ does not have a Release file.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch apt.dockerproject.org/repo/pool/dists/xenial/main/binary-amd64/Packages 403 Forbidden
E: Some index files failed to download. They have been ignored, or old ones used instead.