Ubuntu 13.04 connection problem to internet wifi realtek card RTL8102E/RTL8103E FAMILY PCI-E FAST ETHERNET NIC (NDIS6.20) card

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Buenas tardes tengo una tarjeta interna de redes wifi realtek RTL8102E/RTL8103E FAMILY PCI-E FAST ETHERNET NIC (NDIS6.20) que funciona sin problemas en mi windows 7 ultimate, y al intentar conectarme a través de un DVD booteable o un de un disco duro extraible USB persistente, buteando en UBuntu 13.04 no puedo encontrar la forma de conectarme a internet por wifi. . He realizado de todo, he visto que detecta mi red wifi y veo como si se tratará de conectar y siempre al pasar unos cortos minutos se cae sin nunca poder llegar a estar conectado. Al abrir cualquier página web en el navegador firefox siempre me sale que no tengo red, y nunca me he podido conectar. También lo he intentado hacer con una tarjeta wifi externa D-LINK DWL 122 y no me puedo conectar tampoco a mi red.

Utilizando el backtrack 5r3 a través de un DVD de arranque no me puedo conectar a internet, ni a través del USB persistente para arranca BT5r3, y si lo uso a través de la máquina virtual de VMware, si puedo acceder a internet en el navegador de firefox, pero no me puedo ponerlo en modo monitor usando el comando airmon-ng.

Es muy frustrante llevo mirando mil foros en google y realizado todas las opciones, no sé si Ubuntu no sirve con mis tarjetas interna o externa usb de redes wifi o si son los drivers que cambian en ubuntu o backtrack, o es cosa de que tengo q actualizados o si es otra cosa.

Necesito ayuda urgente,
muchas gracias anticipadas!
p
Good afternoon !
I have an internal wifi card for networks “Realtek RTL8102E/RTL8103E FAMILY PCI-E Fast Ethernet NIC (NDIS6.20)” that works without problems in my Windows 7 Ultimate, and when I try to connect through a bootable DVD or to a removable hard disk as a USB persistent, starting Ubuntu 13.04 I cannot find a way to connect to internet through my wifi networks . I have tried almost everything I ´ve seen on google, I have seen that in Ubuntu it detects my wifi network as if it will try to connect to it but always after a couple of minutes it drops down and brings the message of connection failure. When I tried to access any web site using Firefox it always comes up the message that there is no network connection. Also I have tried to do it using an external usb wifi card D-LINK DWL 122, and it can't connect neither.

Using the backtrack 5r3 booting from a a bootable DVD I can´t access to wifi either in the internal wifi card or external, and when used the console command airmon-ng it doesn t show up monitor mode, and I tried running the BackTrack 5 r3 in Vmware, it let´s me connect to internet in firefox, but still I can´t run the command airmon-ng to start monitor mode.

I have tried to look for an answer in google, and don't know if it´s due to Ubuntu or my internal wifi networks cards or if this is due to the drivers installation that may be different for Ubuntu, or the programme doesn´t read them, it ´s quiet frustrating though…
I need urgent help,
many thanks in advance!
P

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This -> RTL8102E/RTL8103E FAMILY PCI-E FAST ETHERNET NIC (NDIS6.20) is a Ethernet card adapter.

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