La conexión apt-get falló

La conexión apt-get falló

Sudo apt-get update falla con el siguiente error:

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.

Entonces parece que apt-get no puede descargar el archivo, pero wget puede descargarlo:

$ 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]

¿Alguna idea de cuál podría ser el problema?

EDITAR: La pregunta y respuesta mencionadas se refieren a un repositorio específico que no está disponible y el autor de la pregunta recibe un error 404. En mi caso el repositorio está disponible y no hay ningún error 404.

Además lo siguiente no son errores, son advertencias y avisos:

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.

El error:

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

y:

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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