Problema con la impresora

Hola. Tengo Ubuntu 7.04 y tengo instalada una hp 720c (impresora antigua). Logré por internet la forma de que el sistema me la detectara y pudiera imprimir con ella. De esto hace 2 meses y he podido imprimir. Hoy he intentado imprimir un documento pero no me lo imprime. Estos son los errores de salida del log de errores:

E [17/Oct/2007:13:03:59 +0200] Pause-Printer: Unauthorized
E [17/Oct/2007:13:04:47 +0200] Resume-Printer: Unauthorized
E [17/Oct/2007:13:07:11 +0200] PID 24166 (/usr/lib/cups/backend/hp) crashed on signal 9!
E [17/Oct/2007:13:08:13 +0200] cupsdAuthorize: Local authentication certificate not found!
E [17/Oct/2007:13:08:13 +0200] cupsdAuthorize: Local authentication certificate not found!
E [17/Oct/2007:13:08:18 +0200] cupsdAuthorize: Local authentication certificate not found!
E [17/Oct/2007:13:08:18 +0200] cupsdAuthorize: Local authentication certificate not found!
E [17/Oct/2007:13:08:18 +0200] cupsdAuthorize: Local authentication certificate not found!

Gracias

http://www.google.es/search?hl=es&q=cupsdAuthorize&btnG=Buscar+con+Google&meta=

Salu2

http://img359.imageshack.us/img359/6631/celliigy4.pngKeep on Rollin' :mad: