Hola soy nuevo en linux. En mi ubuntu me sale en siguiente error y no se que hacer. estos repositorios los tengo que borrar, o que tengo que hacer? desde ya muchas gracias y un saludo a todos.<br><br><br>" Error de GPG: <a href="http://dl.google.com">http://dl.google.com</a> testing Release Las firmas siguientes no se pudieron verificar porque su llave pública no está disponible: NO_PUBKEY A040830F7FAC5991Error de GPG: <a href="http://www.bashterritory.com">http://www.bashterritory.com</a> Release Las siguientes firms fueron inválidas: NODATA 1 NODATA 2Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/avant-window-navigator/binary-i386/Packages">http://download.tuxfamily.org/syzygy42/dists/feisty/avant-window-navigator/binary-i386/Packages</a> 404 Not Found<br>
Imposible obtener <a href="http://www.bashterritory.com/pytube/releases/Packages.bz2">http://www.bashterritory.com/pytube/releases/Packages.bz2</a> El subproceso bzip2 devolvió un código de error (2)<br>Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/deb/binary-i386/Packages">http://download.tuxfamily.org/syzygy42/dists/feisty/deb/binary-i386/Packages</a> 404 Not Found<br>
Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/http://download.tuxfamily.org/syzygy42//binary-i386/Packages">http://download.tuxfamily.org/syzygy42/dists/feisty/http://download.tuxfamily.org/syzygy42//binary-i386/Packages</a> 404 Not Found<br>
Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/feisty/binary-i386/Packages">http://download.tuxfamily.org/syzygy42/dists/feisty/feisty/binary-i386/Packages</a> 404 Not Found<br>Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/avant-window-navigator/source/Sources">http://download.tuxfamily.org/syzygy42/dists/feisty/avant-window-navigator/source/Sources</a> 404 Not Found<br>
Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/deb-src/source/Sources">http://download.tuxfamily.org/syzygy42/dists/feisty/deb-src/source/Sources</a> 404 Not Found<br>Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/http://download.tuxfamily.org/syzygy42//source/Sources">http://download.tuxfamily.org/syzygy42/dists/feisty/http://download.tuxfamily.org/syzygy42//source/Sources</a> 404 Not Found<br>
Imposible obtener <a href="http://download.tuxfamily.org/syzygy42/dists/feisty/feisty/source/Sources">http://download.tuxfamily.org/syzygy42/dists/feisty/feisty/source/Sources</a> 404 Not Found<br>Algunos archivos de índice no se han podido descargar, se han ignorado,<br>
o se ha utilizado unos antiguos en su lugar. "<br>