[Techtalk] Unreadable(?) pdf files

[David Sumbler]

On Sat, 2016-03-12 at 11:20 +0000, James Sutherland wrote:
> One other option you might try is opening the files in CorelDraw, since 
> that seems to be the application which created them originally? I looked 
> online and saw a few references to it creating PDFs which appear blank 
> in other applications, due to different interpretations of the PDF 
> standard. CorelDraw itself is probably the most likely to understand its 
> own output, after all.

I do not have access to CorelDraw, and even if I had it would presumably
mean using a Windows machine or emulator.

However, I find that sK1 supposedly can act as a substitute, so I
downloaded it.

In order to run 'python setup.py build' (prior to 'python setup.py
install') as instructed in the README file, I needed to install quite a
number of packages on my Ubuntu 12.04 system.  The packages required are
listed in README.

All of them installed without difficulty apart from one:
'sudo apt-get install liblcms2-dev' produces the following error
message:

***
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help resolve the situation:

The following packages have unmet dependencies.
 liblcms2-dev : Depends: liblcms2-2 (= 2.2+git20110628-2ubuntu3.1) but
2.4-0ubuntu3.1~precise1~ppa1 is to be installed
E: Unable to correct problems, you have held broken packages.
***

I do not understand this message, nor what I should do about it.  I ran
'sudo apt-get autoclean' but this did not help.

liblcms2-2 is already installed, and is "already the latest version".

How do I get around this problem?

David