Wkhtmltopdf failed (error code: -6). Message: The switch --header-spacing, is not support using unpatched qt, and will be ignored.The switch --header-html, is not support using unpatched qt, and will be ignored.The switch --footer-html, is not support using unpatched qt, and will be ignored.QXcbConnection: Could not connect to display. # https:/…

fix.wkhtmltopdf.odoo.snippetbucket.erp.open.source.seo.sh

# https://www.snippetbucket.com/ 
# ODOO ERP Django PHP Android AngularJS implementation and customization.
# Most Simple and Quick Way:

cd /opt/
wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.3/wkhtmltox-0.12.3_linux-generic-amd64.tar.xz
tar vxf wkhtmltox-0.12.3_linux-generic-amd64.tar.xz 
cp wkhtmltox/bin/wk* /usr/local/bin/
And you can confirm with:

$ wkhtmltopdf --version
wkhtmltopdf 0.12.3 (with patched qt)

###### That's it

# More over.....

#for debian stretch version
wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb
sudo dpkg -i wkhtmltox_0.12.5-1.stretch_amd64.deb


# for other
https://github.com/wkhtmltopdf/wkhtmltopdf/releases/0.12.5











# long way procedue if above not works 
# How to Fix it:
#################


1. Remove wkhtmltopdf and related package
$ sudo apt-get remove libqt4-dev qt4-dev-tools wkhtmltopdf

$ sudo apt-get autoremove

2. Install requirement package for compiling
$ sudo apt-get install openssl build-essential libssl-dev libxrender-dev git-core libx11-dev libxext-dev libfontconfig1-dev libfreetype6-dev fontconfig -y

3. Clone from git wkhtmltopdf and qt source
$ git clone git://github.com/wkhtmltopdf/wkhtmltopdf.git wkhtmltopdf

$ mkdir qt-wkhtmltopdf && cd qt-wkhtmltopdf

$ git clone https://www.github.com/wkhtmltopdf/qt --depth 1 --branch wk_4.8.7 --single-branch .

4. Compile qt
$ sudo ./configure -nomake tools,examples,demos,docs,translations -opensource -prefix "`pwd`" `cat ../wkhtmltopdf/static_qt_conf_base ../wkhtmltopdf/static_qt_conf_linux | sed -re '/^#/ d' | tr '\n' ' '`

$ sudo make -j3

$ sudo make install

5. Compile wkhtmltopdf
$ cd ../wkhtmltopdf

$ sudo ../qt-wkhtmltopdf/bin/qmake

$ sudo make -j3

$ sudo make install

6. Reboot
$ sudo reboot













#http://www.grobak.net/id/blog/how-fix-wkhtmltopdf-failed-error-code-6