The Xerox Phaser 6125N printer is a great piece of work, however it is not supported by default under Linux (Ubuntu 11.04 x64). 

= Getting it to work =

You can how-ever use little trick to adjust the provided driver of the [http://onlinesupport.fujixerox.com/setupDriverForm.do?ctry_code=SG&lang_code=en&d_lang=en&pid=DPC525A Fuji-Xerox DPC525A] CUPS ppd in such a way that is also works fine for this printer. As described over here http://ubuntuforums.org/showthread.php?t=1205253. 

= New Features =

This steps how-ever does not alter the ppd file in such a way that it is automatically detected, the attached files have two new features:
1. provide autodetect support for both USB and UTP printing.
1. Set the feeder to 250 pages by default, instead of none.
1. Removed the non-standard and unsupported FXPostCard.

= Download & Install =

== For the (Debian Ubuntu) folks ==
1. Download [raw-attachment:cups-xerox-phaser-6125n-1.0.0.deb]
1. $ sudo dpkg -i cups-xerox-phaser-6125n-1.0.0.deb

When running 64bit you will also need to install a bunch of 32 bit libraries to get it working:
1. $ sudo apt-get install libc6-i386

== For the non-deb (Fedora, OpenSuSE) folks ==
1. Download [raw-attachment:cups-xerox-phaser-6125n-1.0.0.tar.gz]
1. $ sudo tar -C / --no-overwrite-dir --keep-newer-files -xvzf cups-xerox-phaser-6125n-1.0.0.tar.gz 

When running Fedora 18,19,20,21,22,23,24 64bit you will also need to install a bunch of 32 bit libraries to get it working.
1. $ sudo yum install /lib/ld-linux.so.2 /usr/lib/libcups.so.2

When running Fedora 25 64bit you will also need to install a bunch of 32 bit libraries to get it working
1. $ sudo dnf install /lib/ld-linux.so.2 /usr/lib/libcups.so.2

= Troubleshooting =
The package might create insecure permissions, causing the filter to fail as shown in /var/log/cups/error_log:
{{{
 E [21/Apr/2014:13:20:23 +0200] Phaser-6125N: Directory "/usr/lib/cups/filter" has insecure permissions (040775/uid=0/gid=0).
}}}
 $ sudo chmod 0755 /usr/local/cups/filters

= Debugging Fedora 27 =
Starting from Fedora 27 the printer stopped working. Causing me to dive deeper into the magic world of printing.The printer has HBPL support. Yet the HBPLv1 driver from [http://foo2zjs.rkkda.com/ foo2zjs] does not give me any output at all.The HPBLv2 driver at [http://foo2hbpl.rkkda.com/ foo2hpbl] does not work, giving error code `PDL ERROR 016-720`. I am currently using the  [https://fedoraproject.org/wiki/How_to_debug_printing_problems Fedora printer debugging guide] to find out how-to get the original driver - which seems to send a modified version of postscript - to work again.

I gave up. Swapped printer for older well suported [wiki:SamsungML1750] printer attached to my FreeBSD Server.
= Windows 10 driver Support =
There is no Windows 10 driver Support for the Xerox Phaser 6125N anymore, yet the [http://onlinesupport.fujixerox.com/setupDriverForm.do?ctry_code=SG&lang_code=en&d_lang=en&pid=DPC525A Fuji-Xerox DPC525A] driver works fine. Do mind you need to change some options like telling tray 1 has an 250 sheet feeder and set memory support to 64MB, but at least you do not need to buy another printer. 

= Need Help? = 
If you can not get it work as expected. Please drop me an [mailto:info@rickvanderzwet.nl?subject=Xerox%20Phaser%206125N%20Question email]