Error 404 con apt-get update, No tengo ningún PPA

Cuando ejecuto sudo apt-get update recibo errores 404, no tengo ningún PPA.

jeggy@Jeggy-XPS:~$ sudo apt-get update [sudo] password for jeggy: Ign http://dk.archive.ubuntu.com utopic InRelease Ign http://dk.archive.ubuntu.com utopic-updates InRelease Ign http://dk.archive.ubuntu.com utopic-backports InRelease Hit http://dk.archive.ubuntu.com utopic Release.gpg Hit http://dk.archive.ubuntu.com utopic-updates Release.gpg Hit http://dk.archive.ubuntu.com utopic-backports Release.gpg Hit http://dk.archive.ubuntu.com utopic Release Hit http://dk.archive.ubuntu.com utopic-updates Release Ign http://extras.ubuntu.com utopic InRelease Hit http://dk.archive.ubuntu.com utopic-backports Release Hit http://extras.ubuntu.com utopic Release.gpg Hit http://extras.ubuntu.com utopic Release Ign http://security.ubuntu.com utopic-security InRelease Get:1 http://security.ubuntu.com utopic-security Release.gpg [933 B] Hit http://extras.ubuntu.com utopic/main Sources Get:2 http://dk.archive.ubuntu.com utopic/main Sources [1.046 kB] Get:3 http://security.ubuntu.com utopic-security Release [59,7 kB] Hit http://extras.ubuntu.com utopic/main amd64 Packages Hit http://extras.ubuntu.com utopic/main i386 Packages Get:4 http://security.ubuntu.com utopic-security/main Sources [7.232 B] Get:5 http://security.ubuntu.com utopic-security/restricted Sources [14 B] Get:6 http://security.ubuntu.com utopic-security/universe Sources [14 B] Get:7 http://security.ubuntu.com utopic-security/multiverse Sources [14 B] Get:8 http://security.ubuntu.com utopic-security/main amd64 Packages [15,0 kB] Get:9 http://security.ubuntu.com utopic-security/restricted amd64 Packages [14 B] Ign http://extras.ubuntu.com utopic/main Translation-en_US Get:10 http://security.ubuntu.com utopic-security/universe amd64 Packages [2.645 B] Ign http://extras.ubuntu.com utopic/main Translation-en Get:11 http://security.ubuntu.com utopic-security/multiverse amd64 Packages [14 B] Get:12 http://security.ubuntu.com utopic-security/main i386 Packages [14,6 kB] Get:13 http://security.ubuntu.com utopic-security/restricted i386 Packages [14 B] Get:14 http://security.ubuntu.com utopic-security/universe i386 Packages [2.652 B] Get:15 http://security.ubuntu.com utopic-security/multiverse i386 Packages [14 B] Hit http://security.ubuntu.com utopic-security/multiverse Translation-en Hit http://security.ubuntu.com utopic-security/restricted Translation-en Hit http://security.ubuntu.com utopic-security/main Translation-en Hit http://security.ubuntu.com utopic-security/universe Translation-en Get:16 http://dk.archive.ubuntu.com utopic/multiverse Sources [171 kB] Get:17 http://dk.archive.ubuntu.com utopic/multiverse amd64 Packages [131 kB] Get:18 http://dk.archive.ubuntu.com utopic-updates/main Sources [4.264 kB] Get:19 http://dk.archive.ubuntu.com utopic-updates/restricted Sources [7.232 B] Get:20 http://dk.archive.ubuntu.com utopic-updates/universe Sources [14 B] Get:21 http://dk.archive.ubuntu.com utopic-updates/multiverse Sources [14 B] Get:22 http://dk.archive.ubuntu.com utopic-updates/main amd64 Packages [14 B] Get:23 http://dk.archive.ubuntu.com utopic-updates/restricted amd64 Packages [15,0 kB] Get:24 http://dk.archive.ubuntu.com utopic-updates/universe amd64 Packages [14 B] Get:25 http://dk.archive.ubuntu.com utopic-updates/multiverse amd64 Packages [2.645 B] Get:26 http://dk.archive.ubuntu.com utopic-updates/main i386 Packages [14 B] Get:27 http://dk.archive.ubuntu.com utopic-updates/restricted i386 Packages [14,6 kB] Get:28 http://dk.archive.ubuntu.com utopic-updates/universe i386 Packages [14 B] Get:29 http://dk.archive.ubuntu.com utopic-updates/multiverse i386 Packages [2.652 B] Get:30 http://dk.archive.ubuntu.com utopic-updates/main Translation-en [14 B] Get:31 http://dk.archive.ubuntu.com utopic-updates/multiverse Translation-en [10,0 kB] Get:32 http://dk.archive.ubuntu.com utopic-updates/restricted Translation-en [14 B] Get:33 http://dk.archive.ubuntu.com utopic-backports/restricted Sources [14 B] Hit http://dk.archive.ubuntu.com utopic-backports/restricted Translation-en Hit http://dk.archive.ubuntu.com utopic-backports/universe Translation-en Get:34 http://dk.archive.ubuntu.com utopic/restricted Sources [575 B] Get:35 http://dk.archive.ubuntu.com utopic/restricted amd64 Packages [18,4 kB] Get:36 http://dk.archive.ubuntu.com utopic/universe amd64 Packages [8.000 kB] Hit http://dk.archive.ubuntu.com utopic-backports/main Sources Hit http://dk.archive.ubuntu.com utopic-backports/universe Sources Hit http://dk.archive.ubuntu.com utopic-backports/multiverse Sources Hit http://dk.archive.ubuntu.com utopic-backports/main amd64 Packages Hit http://dk.archive.ubuntu.com utopic-backports/restricted amd64 Packages Hit http://dk.archive.ubuntu.com utopic-backports/universe amd64 Packages Hit http://dk.archive.ubuntu.com utopic-backports/multiverse amd64 Packages Hit http://dk.archive.ubuntu.com utopic-backports/main i386 Packages Hit http://dk.archive.ubuntu.com utopic-backports/restricted i386 Packages Hit http://dk.archive.ubuntu.com utopic-backports/universe i386 Packages Hit http://dk.archive.ubuntu.com utopic-backports/multiverse i386 Packages Get:37 http://dk.archive.ubuntu.com utopic/universe Sources [8.345 kB] Err http://dk.archive.ubuntu.com utopic/main amd64 Packages 404 Not Found [IP: 194.19.194.51 80] Err http://dk.archive.ubuntu.com utopic/main i386 Packages 404 Not Found [IP: 194.19.194.51 80] Err http://dk.archive.ubuntu.com utopic/restricted i386 Packages 404 Not Found [IP: 194.19.194.51 80] Err http://dk.archive.ubuntu.com utopic/universe i386 Packages 404 Not Found [IP: 194.19.194.51 80] Err http://dk.archive.ubuntu.com utopic/multiverse i386 Packages 404 Not Found [IP: 194.19.194.51 80] Hit http://dk.archive.ubuntu.com utopic/multiverse Translation-en Hit http://dk.archive.ubuntu.com utopic/restricted Translation-en Get:38 http://dk.archive.ubuntu.com utopic/universe Translation-en [19,5 MB] Get:39 http://dk.archive.ubuntu.com utopic-updates/universe Translation-en [5.776 B] Get:40 http://dk.archive.ubuntu.com utopic-backports/main Translation-en Get:41 http://dk.archive.ubuntu.com utopic-backports/multiverse Translation-en Hit http://dk.archive.ubuntu.com utopic/main Translation-en Fetched 32,3 MB in 10min 11s (52,8 kB/s) W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic/restricted/source/Sources Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic/main/binary-amd64/Packages 404 Not Found [IP: 194.19.194.51 80] W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic/main/binary-i386/Packages 404 Not Found [IP: 194.19.194.51 80] W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic/restricted/binary-i386/Packages 404 Not Found [IP: 194.19.194.51 80] W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic/universe/binary-i386/Packages 404 Not Found [IP: 194.19.194.51 80] W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic/multiverse/binary-i386/Packages 404 Not Found [IP: 194.19.194.51 80] W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/source/Sources Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/source/Sources Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/binary-amd64/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/binary-amd64/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/binary-amd64/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/multiverse/binary-amd64/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/binary-i386/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/binary-i386/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/binary-i386/Packages Hash Sum mismatch W: Failed to fetch http://dk.archive.ubuntu.com/ubuntu/dists/utopic-updates/multiverse/binary-i386/Packages Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead. jeggy@Jeggy-XPS:~$ 

¿Por qué sucede esto y cómo solucionarlo? Estoy ejecutando Ubuntu 14.10

Esta es probablemente solo una condición de carrera mientras se actualiza el espejo. También es posible que estés detrás de un proxy transparente, tal vez incluso sin que lo sepas.

De todos modos, solo espere un par de horas o toda la noche e intente nuevamente.

Si el error persiste, puede cambiar a otro repository (por ejemplo … us.archive.ubuntu.com …) o eliminar los archivos de índice descargados anteriormente en el directorio /var/lib/apt/lists .

Estoy teniendo el mismo problema con los servidores de ru .

Hay un error en LaunchPad: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1394494

La solución actual es cambiar al servidor principal:

introduzca la descripción de la imagen aquí

O tienes un problema con tu internet o el servidor está temporalmente caído. Puedes intentarlo de nuevo en otro momento.

Puedes verificar si puedes alcanzar el servidor con wget:

 wget http://dk.archive.ubuntu.com/ 

ACTUALIZACIÓN: si alguien más se encuentra con este problema, arreglé el mío reemplazando el contenido de /etc/apt/sources.list con lo siguiente:

 deb http://us.archive.ubuntu.com/ubuntu/ vivid main deb http://us.archive.ubuntu.com/ubuntu/ vivid-updates main 

… luego ejecute sudo apt-get dist-upgrade .

Probé los servidores de los Estados Unidos como dicen algunos y no funcionó. Probado algunos servidores holandeses y no funcionó, hay muchos servidores de Ubuntu que no funcionan o no están disponibles. Aunque Ubuntu tiene una opción para buscar un mejor servidor disponible y que funcione . Ahora funciona.

 sudo update-manager 

y luego seleccione la pestaña Ubuntu Software -> Downloaded from -> other -> Select Best server

Ahora funciona

introduzca la descripción de la imagen aquí