Hi Sebastien.
Thank You for an answer. And I apologize for such a long time without my
answer. (An accident, nothing serious).
So Sebastien, please tell me, which informations exactly do you need?
I'm thinking about a `journalctl -b 0` command, of course. Is there
something specific, that you want or need to gather?
I'm asking, because there is not *any* informations about Evince or
loading backend for 'application/pdf' - for example - in system log
files, such as »/var/log/{syslog,kern.log}«, even right after trying to
open '.pdf' or 'djvu' files etc. (as you asked for it in your comment).
I mean nothing valuable, that can help to diagnose this problem.
Yes, there is the same problem with '.djvu' files - they cannot be
opened via Evince. Summarizing: I have problems not only with '.pdf',
but with '.djvu' files also. I have no idea what about other supported
file formats (please see 4. and Evince AppArmor profile), because I
can't test them, right now. And honestly, I don't know if I will be able
to do this. Sorry. (So, I updated the bug report and added this
information).
Sebastien, you also asked about the result of the `debsums(1)` for
'libevdocument3-4', right? I had to install `debsums` package first but
here it is:
,----[ $ debsums libevdocument3-4 ]
| /usr/lib/i386-linux-gnu/evince/4/backends/comicsdocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/djvudocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/dvidocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/libcomicsdocument.so
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/libdjvudocument.so
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/libdvidocument.so
FAILED
| /usr/lib/i386-linux-gnu/evince/4/backends/libpdfdocument.so
FAILED
| /usr/lib/i386-linux-gnu/evince/4/backends/libpsdocument.so
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/libtiffdocument.so
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/libxpsdocument.so
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/pdfdocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/psdocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/tiffdocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/evince/4/backends/xpsdocument.evince-backend
OK
| /usr/lib/i386-linux-gnu/libevdocument3.so.4.0.0
OK
| /usr/share/doc/libevdocument3-4/AUTHORS
OK
| /usr/share/doc/libevdocument3-4/NEWS.gz
OK
| /usr/share/doc/libevdocument3-4/README
OK
| /usr/share/doc/libevdocument3-4/TODO
OK
| /usr/share/doc/libevdocument3-4/changelog.Debian.gz
OK
| /usr/share/doc/libevdocument3-4/copyright
OK
| /usr/share/lintian/overrides/libevdocument3-4
OK
`----
As We can see, there are two 'FAILED' results. So the file's MD5 sum
does not match, right? What do you think about this? Is this a bug or
something on my side went wrong?
Sebastien, I apologize You once again, for such a long time without
answer. Best regards.
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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1835285
Title:
PDF files don't open; "Failed to load backend for 'application/pdf':
libpdfdocument.so" and "Invalid ELF header".
Status in evince package in Ubuntu:
Incomplete
Bug description:
Hello.
On Wed, Jun 19. 2019, Evince has been updated to version
'3.18.2-1ubuntu4.5' [1]. This update added, among other things, some
hardening from Ubuntu 18.10 Release. However, now, it is impossible to
open any '.pdf' files. When I try to open such file, there is an
information (on the red background) in the main Evince window. And It
looks this way:
,----[ Opening '.pdf' error ]
|
| Cannot open document „file:///home/user/Docs/foo-bar.pdf”.
| Failed to load backend for 'application/pdf':
| /usr/lib/i386-linux-gnu/evince/4/backends/libpdfdocument.so: Invalid ELF
| header
|
`----
There is a reference to »/usr/lib/i386-linux-
gnu/evince/4/backends/libpdfdocument.so«. According to `dpkg(1)`
command this file is a part of the 'libevdocument3-4' package, which
is installed already (version '3.18.2-1ubuntu4.5'). I also tried to
open '.pdf' file via terminal, but nothing changed. Here are the
results:
,----[ $ evince Docs/foo-bar.pdf ]
|
| (evince:26918): EvinceDocument-WARNING **:
| /usr/lib/i386-linux-gnu/evince/4/backends/libpdfdocument.so: Invalid ELF
| header
|
| (evince:26918): EvinceDocument-WARNING **:
| /usr/lib/i386-linux-gnu/evince/4/backends/libpdfdocument.so: Invalid ELF
| header
|
`----
I think, that the whole problem is/could be related with AppArmor and
Evince profile changes in the latest update, because - for example -
day before, before update, everything was okay. Anyway, described
problem/issue started to happen right after Evince update. (To check
differences between AppArmor profile versions, please see 2. and 3.).
There is one more thing to notice: Evince profile, has never been
changed by the User.
If it's about AppArmor: I've tried to change Evince profile mode from
'enforce' to 'complain'. Unfortunately, nothing changed. There wasn't
any valuable entries in system log files etc. (I'm sorry, but for now,
I can not check other variants/solutions, such as: (a) disable Evince
profile via `aa-disable(8)` command or (b) make links between
»/etc/apparmor.d/usr.bin.evince« file and »/etc/apparmor.d/disable/«
directory, next use `apparmor_parser(8)` command to remove profile
etc.)
✖ NOTE: to make some more tests, I've tried to open '.djvu' file, but
without success. It seems, that there is exactly the same informations
as with '.pdf' files. Of course, Evince
(»/etc/apparmor.d/usr.bin.evince«) profile contains rule to open such
file format etc. and many others, see 4. So, according to all of this,
maybe "Summary" should be changed to reflect this situation? Maybe
something like: "PDF and other files don't open; "Failed to load
(...)".
Sebastien, what do You think?.
Here are some additional informations:
✗ Description: Ubuntu 16.04.6 LTS
✗ Release: 16.04
✗ Architecture: x86_32/i386
✗ Linux: 4.4.0-155-generic
✓ AppArmor: 2.10.95-0ubuntu2.11
✓ Evince: 3.18.2-1ubuntu4.5
Best regards.
______________
[1] https://lists.ubuntu.com/archives/xenial-changes/2019-June/024691.html
[2]
http://launchpadlibrarian.net/429511526/evince_3.18.2-1ubuntu4.4_3.18.2-1ubuntu4.5.diff.gz
[3]
http://launchpadlibrarian.net/429293224/evince_3.18.2-1ubuntu4.1_3.18.2-1ubuntu4.5.diff.gz
[4]
https://wiki.gnome.org/action/show/Apps/Evince/SupportedDocumentFormats?action=show&redirect=Evince%2FSupportedDocumentFormats
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