[unoconv] Conversion from odg to png file fails

[a24-yamaguchi]

Webサイト更新手順の中にodgからpngの変換としてunoconvが使われているが、ErrCode2074を吐いて
失敗している。
このため、次のURLのpngファイルが404になる。
http://www.hatohol.org/assets/images/diagrams/distributed-monitoring.png
http://www.hatohol.org/assets/images/diagrams/integrated-monitoring.png
※現状バックアップから手コピーで復元

発生するエラー。

unoconv: UnoException during export phase:
Unable to store document to file:///path/to/work/src/web_compiled/assets/images/diagrams.png (ErrCode 2074)

Properties: ((com.sun.star.beans.PropertyValue){ Name = (string)"FilterName", Handle = (long)0x0, Value = (any){ (string)"impress_png_Export" }, State = (com.sun.star.beans.PropertyState)DIRECT_VALUE }, (com.sun.star.beans.PropertyValue){ Name = (string)"OutputStream", Handle = (long)0x0, Value = (any){ (com.sun.star.uno.XInterface)0x225c258{, supportedInterfaces={com.sun.star.lang.XTypeProvider,com.sun.star.io.XOutputStream}} }, State = (com.sun.star.beans.PropertyState)DIRECT_VALUE }, (com.sun.star.beans.PropertyValue){ Name = (string)"Overwrite", Handle = (long)0x0, Value = (any){ (boolean)true }, State = (com.sun.star.beans.PropertyState)DIRECT_VALUE })
Failed to copy /path/to/work/src/website/contents/assets/images/diagrams/distributed-monitoring.odg to /path/to/work/src/web_compiled/assets/images/diagrams/distributed-monitoring.png

環境

$ uname -a
Linux server09 4.8.15-040815-generic #201612151231 SMP Thu Dec 15 17:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS"

$ dpkg -l | grep -i libreoffice
ii  hyphen-en-us                                2.8.8-2ubuntu1                                all          US English hyphenation patterns for LibreOffice/OpenOffice.org
ii  libreoffice-avmedia-backend-gstreamer       1:5.1.4-0ubuntu1                              amd64        GStreamer backend for LibreOffice
ii  libreoffice-base-core                       1:5.1.4-0ubuntu1                              amd64        office productivity suite -- shared library
ii  libreoffice-calc                            1:5.1.4-0ubuntu1                              amd64        office productivity suite -- spreadsheet
ii  libreoffice-common                          1:5.1.4-0ubuntu1                              all          office productivity suite -- arch-independent files
ii  libreoffice-core                            1:5.1.4-0ubuntu1                              amd64        office productivity suite -- arch-dependent files
ii  libreoffice-draw                            1:5.1.4-0ubuntu1                              amd64        office productivity suite -- drawing
ii  libreoffice-gnome                           1:5.1.4-0ubuntu1                              amd64        office productivity suite -- GNOME integration
ii  libreoffice-gtk                             1:5.1.4-0ubuntu1                              amd64        office productivity suite -- GTK+ integration
ii  libreoffice-help-en-us                      1:5.1.4-0ubuntu1                              all          office productivity suite -- English_american help
ii  libreoffice-help-ja                         1:5.1.4-0ubuntu1                              all          office productivity suite -- Japanese help
ii  libreoffice-impress                         1:5.1.4-0ubuntu1                              amd64        office productivity suite -- presentation
ii  libreoffice-l10n-ja                         1:5.1.4-0ubuntu1                              all          office productivity suite -- Japanese language package
ii  libreoffice-math                            1:5.1.4-0ubuntu1                              amd64        office productivity suite -- equation editor
ii  libreoffice-ogltrans                        1:5.1.4-0ubuntu1                              amd64        LibreOffice Impress extension for slide transitions using OpenGL
ii  libreoffice-pdfimport                       1:5.1.4-0ubuntu1                              amd64        PDF Import component for LibreOffice
ii  libreoffice-style-breeze                    1:5.1.4-0ubuntu1                              all          office productivity suite -- Breeze symbol style
ii  libreoffice-style-elementary                1:5.1.4-0ubuntu1                              all          office productivity suite -- Elementary symbol style
ii  libreoffice-style-galaxy                    1:5.1.4-0ubuntu1                              all          office productivity suite -- Galaxy (Default) symbol style
ii  libreoffice-style-human                     1:5.1.4-0ubuntu1                              all          office productivity suite -- Human symbol style
ii  libreoffice-writer                          1:5.1.4-0ubuntu1                              amd64        office productivity suite -- word processor
ii  mythes-en-us                                1:5.1.0-1ubuntu2.2                            all          English (USA) Thesaurus for LibreOffice
ii  ubuntu-mate-libreoffice-draw-icons          16.04.5.3                                     all          Ubuntu MATE desktop icons for LibreOffice draw
ii  uno-libs3                                   5.1.4-0ubuntu1                                amd64        LibreOffice UNO runtime environment -- public shared libraries
ii  unoconv                                     0.7-1.1                                       all          converter between LibreOffice document formats
ii  ure                                         5.1.4-0ubuntu1                                amd64        LibreOffice UNO runtime environment