On Sat, Nov 10, 2018 at 02:32:19PM -0500, Scott Kostyshak wrote: > On Sat, Nov 10, 2018 at 02:14:58PM -0500, Paul A. Rubin wrote: > > On 11/5/18 2:32 PM, Jeff Defoe wrote: > > > I realized I was using the Lyx from the Ubuntu repository. When I > > > removed it, added the PPA, and installed LyX from that -- it now seems > > > to work. > > > > > > I do, however, have an odd problem where graphics often don't display in > > > LyX, giving errors such as "error loading file into memory" or "error > > > converting to loadable format" which I didn't get before upgrading to > > > Ubuntu 18.04. > > > > > > Best regards, > > > > > > Jeff > > > > > > > > One possibility has to do with Imagemagick. I recently opened an old LyX > > file with some EPS graphics, and got the "error converting" message on all > > of them. In Tools > Preferences... > File Handling > Converters, the > > converter for EPS to PNG is correctly configured to use the Imagemagick > > convert command. The catch is that recent versions of Imagemagick apparently > > ship with seriously anal retentive permissions by default. If you run > > "convert something.eps something.png" in a terminal, you get an error saying > > something about not being allowed access. > > > > The fix is to open /etc/Imagemagick-6/policy.xml in an editor, using root > > privileges, and comment out the line "<policy domain="coder" rights="none" > > pattern="EPS" />". I also commented out the equivalent lines for PS, PDF and > > XPS just to be safe. After that, LyX was able to display the EPS images. > > I had to do something similar on Ubuntu 18.04 in order to convert PDF > files. The following was helpful: > > https://stackoverflow.com/questions/42928765/convertnot-authorized-aaaa-erro
The security problems of ghostscript which caused the policy restrictions were fixed with the release of ghostscript 9.25 (released 2018-09-13). I quickly looked at ubuntu packages and 18.04 already ships 9.25, so it would be worth filing bug in ubuntu bug system to drop their imagemagick policy fix otherwise postscript conversion stops working forever in ubuntu. Pavel
