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apt-get接続に失敗しました

tag-icon • tag-icon 16.04 apt
apt-get接続に失敗しました

sudo apt-get update は次のエラーで失敗します:

Err:3 http://localrepo.local/ubuntu xenial/main amd64 Packages
  Connection failed
Ign:4 http://localrepo.local/ubuntu xenial/main i386 Packages
Ign:5 http://localrepo.local/ubuntu xenial/main all Packages
Ign:6 http://localrepo.local/ubuntu xenial/main Translation-en_GB
Ign:7 http://localrepo.local/ubuntu xenial/main Translation-en
Ign:8 http://localrepo.local/ubuntu xenial/restricted amd64 Packages
Ign:9 http://localrepo.local/ubuntu xenial/restricted i386 Packages
Ign:10 http://localrepo.local/ubuntu xenial/restricted all Packages
Ign:11 http://localrepo.local/ubuntu xenial/restricted Translation-en_GB
Ign:12 http://localrepo.local/ubuntu xenial/restricted Translation-en
Reading package lists... Done
W: The repository 'http://localrepo.local/ubuntu 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 http://localrepo.local/ubuntu/dists/xenial/main/binary-amd64/Packages  Connection failed
E: Some index files failed to download. They have been ignored, or old ones used instead.

したがって、apt-get ではファイルをダウンロードできないようですが、wget ではダウンロードできます。

$ wget http://localrepo.local/ubuntu/dists/xenial/main/binary-amd64/Packages
--2017-10-04 09:31:18--  http://localrepo.local/ubuntu/dists/xenial/main/binary-amd64/Packages
Resolving localrepo.local(localrepo.local)... 10.38.101.107
Connecting to localrepo.local (localrepo.local)|10.38.101.107|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 7228243 (6.9M)
Saving to: ‘Packages’

Packages                                                100%[===============================================================================================================================>]   6.89M  1.28MB/s    in 5.6s

2017-10-04 09:31:29 (1.23 MB/s) - ‘Packages’ saved [7228243/7228243]

何が問題なのか分かりますか?

編集: 言及されている質問と回答は、利用できない特定のリポジトリに関するもので、質問者は 404 エラーを受け取っています。私の場合、リポジトリは利用可能で、404 エラーは発生していません。

また、以下はエラーではなく、警告と通知です。

W: The repository 'http://localrepo.local/ubuntu 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.

エラー：

Err:3 http://localrepo.local/ubuntu xenial/main amd64 Packages
  Connection failed

そして：

E: Failed to fetch http://localrepo.local/ubuntu/dists/xenial/main/binary-amd64/Packages  Connection failed
E: Some index files failed to download. They have been ignored, or old ones used instead.

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