Comment 5 for bug 306392

Thanks for these new informations, they should help resolve this bug.

To me, it looks like it could be caused by the fact that the 'Helvetica' font is not found on your computer.
Follow is an extract from the given error_log:
D [23/Mar/2009:10:58:57 +0800] [Job 1] Error: /invalidfont in /findfont
D [23/Mar/2009:10:58:57 +0800] [Job 1] Operand stack:
D [23/Mar/2009:10:58:57 +0800] [Job 1] Helvetica
D [23/Mar/2009:10:58:57 +0800] [Job 1] Execution stack:
D [23/Mar/2009:10:58:57 +0800] [Job 1] %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1862 1 3 %oparray_pop 1861 1 3 %oparray_pop 1845 1 3 %oparray_pop 1739 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- 1820 1 3 %oparray_pop
D [23/Mar/2009:10:58:57 +0800] [Job 1] Dictionary stack:
D [23/Mar/2009:10:58:57 +0800] [Job 1] --dict:1158/1684(ro)(G)-- --dict:0/20(G)-- --dict:69/200(L)--
D [23/Mar/2009:10:58:57 +0800] [Job 1] Current allocation mode is local
D [23/Mar/2009:10:58:57 +0800] [Job 1] Last OS error: 2
D [23/Mar/2009:10:58:57 +0800] [Job 1] GPL Ghostscript 8.64: Unrecoverable error, exit code 1
D [23/Mar/2009:10:58:57 +0800] [Job 1] cat: 写入错误: Broken pipe
D [23/Mar/2009:10:58:57 +0800] [Job 1] cat: 写入错误: Broken pipe
D [23/Mar/2009:10:58:57 +0800] PID 3296 (/usr/lib/cups/filter/pdftopdf) exited with no errors.
D [23/Mar/2009:10:58:57 +0800] [Job 1] Filetype: PDF
D [23/Mar/2009:10:58:57 +0800] [Job 1] Storing temporary files in /var/spool/cups/tmp
E [23/Mar/2009:10:58:57 +0800] PID 3295 (/usr/lib/cups/filter/pstopdf) stopped with status 1!
D [23/Mar/2009:10:58:57 +0800] [Job 1] File contains 1 pages

In http://ubuntuforums.org/showthread.php?t=56583 one can read:
"Helvetica is a Microsft font. Whilst it can be 'freely' distributed, it's not published under a free license, hence does not satisfy the Debian policy on licenses and not really Ubuntu's either."

But https://bugs.launchpad.net/bugs/193913 suggest that it may not be so simple.

Well, could you just try to print a document written with an other font?

I am far from being an expert on fonts.
I just looked in OpenOffice, and see, to my surprise in fact, that it use: Liberation Serif
Maybe you can try a "Dejavu ..." font, I think it was the default in the past.