Comment 10 for bug 57822

Robert,
I just noticed in your printingbuginfo.txt that you are using cupsys 1.2.2-0ubuntu0.6.06.001-0ivoks1. Please use the official cupsys 1.2.2-0ubuntu0.6.06 since we cannot support unofficial packages.
This is just a remark, I don't think this will solve your problem.

This information from your cups error_log indicates the problem:
E [04/Nov/2006:11:53:08 +0100] [Job 11] Print file was not accepted (server-error-device-error)!
E [04/Nov/2006:11:53:08 +0100] PID 11215 (/usr/lib/cups/backend/http) stopped with status 1!
D [04/Nov/2006:11:53:08 +0100] [Job 11] File 0 is complete.
I [04/Nov/2006:11:53:08 +0100] [Job 11] Backend returned status 1 (failed)

An explanation of the server-error-device-error can be found here: http://tools.ietf.org/html/rfc2911#section-13.1.5.5

Does raising the LogLevel in /etc/cups/cupsd.conf to debug2 give more information about the server-error-device-error in /var/log/cups/error_log?

I think your problem could be related to bug #55828, Dapper is still affected by this bug.
Please try the workaround of that bug by setting up your printer manually with the following command:
$ lpadmin -p printername -E -v ipp://192.168.1.1:1631/printers/SoHoPRINTER
This will add a new printer with the name "printername".
A potential problem with this workaround is that the "Paper" and "Advanced" tabs are disabled in the "Properties" of your printer in gnome-cups-manager so you won't be able to set printing options on your Ubuntu client.
Let me know if you are able to print with this workaround.

Bug #55828 has been fixed in Ubuntu Edgy, which was released recently (16 Octobre). Also Edgy has a newer cupsys with a number of fixes (1.2.4-2ubuntu3). You could try a desktop cd of Edgy. The desktop cd is a live cd, so you can boot directly from it. After boot you can configure your printer and try if it prints to your router, you don't need to install edgy to your hard drive to try. Edgy can be downloaded here: www.ubuntu.com/download.