On 3/18/20 3:19 PM, Graeme wrote:
I currently use Linux Mint 18.3. Recently I upgraded to LyX 2.3.4.2
using the PPA available at
http://ppa.launchpad.net/lyx-devel/release/ubuntu xenial main
Since this upgrade there have been problems with the display of EPS
and PDF graphics files in the main LyX editor window, and with the
export of files containing PNG and JPEG bitmap images.
These problems are not evident with LyX 2.3.4.3 on Windows 10, nor
were they present with LyX 2.3.3 on Linux Mint 18.3.
Specifically:
1. When including a graphic with either EPS or PDF format, the graphic
is not displayed in the main LyX editor window, but instead there is
an outline box with the EPS or PDF filename, and below it the error
message: Error converting to loadable format.
The graphic does appear correctly in a PDF file exported using either
ps2pdf or pdflatex.
2. When including a graphic with PNG or JPEG format, the graphic is
displayed correctly in the main LyX editor window, but when attempting
to export the LyX file to Postscript, PDF (using ps2pdf), or even just
plain LaTeX, an error pop-up window appears with the title:
LyX: Cannot convert file
and the message:
No information for converting png format files to eps. Define a
converter in the preferences or No information for converting jpg
format files to eps. Define a converter in the preferences.
The PNG and JPEG graphics do appear correctly in a PDF file exported
using pdflatex, but attempting to export with ps2pdf fails.
When exporting the Progress Log window shows the following messages
for a graphic in PNG format:
python -tt "/usr/share/lyx/scripts/convertDefault.py" png
"/tmp/lyx_tmpdir.fGfmcihv6288/lyx_tmpbuf0/2_home_graeme_Documents_GraphicsTestCircle.png"
eps
"/tmp/lyx_tmpdir.fGfmcihv6288/lyx_tmpbuf0/2_home_graeme_Documents_GraphicsTestCircle.eps"
convert: not authorized
`eps:/tmp/lyx_tmpdir.fGfmcihv6288/lyx_tmpbuf0/2_home_graeme_Documents_GraphicsTestCircle.eps'
@ error/constitute.c/WriteImage/1028.
/usr/share/lyx/scripts/convertDefault.py ERROR
Execution of "convert" failed.support/Systemcall.cpp (276):
Systemcall: 'python -tt "/usr/share/lyx/scripts/convertDefault.py"
png
"/tmp/lyx_tmpdir.fGfmcihv6288/lyx_tmpbuf0/2_home_graeme_Documents_GraphicsTestCircle.png"
eps
"/tmp/lyx_tmpdir.fGfmcihv6288/lyx_tmpbuf0/2_home_graeme_Documents_GraphicsTestCircle.eps"'
finished with exit code 1
Error: Cannot convert file
I get similar messages for a graphic file in JPEG format.
My suspicion is that BOTH the problems above may be linked to the use
of ImageMagick within convertDefault.py, but I am puzzled by the
warning message
"convert: not authorized"
in the fragment above, suggesting it may be something to do with file
or folder permissions.
However, this does not explain why everything seemed to work OK with
LyX 2.3.3 on Mint 18.3
On Mint 18.3 the system-wide installation of ImageMagick is:
ImageMagick 6.8.9-9 Q16 x86_64 2019-11-12
On Windows 10, the LyX2.3.4.3 installer comes bundled with a later
version:
ImageMagick 7.0.9-19 Q16 x86 2020-01-26
which explicitly lists built-in support for gslib and ps, but
ImageMagick 6 does not list these among its "Delegates".
I would welcome advice on how to fix these problems.
Graeme
Confirmed here (same OS and LyX version). Turns out it's a security
issue related to ImageMagick. See this post
<https://cromwell-intl.com/open-source/pdf-not-authorized.html> for the
gory details. If you're willing to take the risk (I am), you can follow
the suggestions in the post, but there may be a quicker way. Wander over
to /etc/Imagick-6 and list the directory. You should see policy.xml and
policy.xml.dpkg-old. They former is the higher security/problematic
policy file in force, and the .dpkg-old version is the looser, less
secure (but more LyX friendly) version. As root, give the new one a new
name or extension to keep it (or delete it if you will) and move or copy
the .dpkg-old version to policy.xml. Worked for me.
Paul
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