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    <p>The instructions also state you must be using the
      ubuntugis-unstable repository.<br>
    </p>
    <div class="moz-cite-prefix">On 23/04/19 3:13 PM, Zhang Qun wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CADk-=6chMr0ic70EBhPKewTSvjEdUWGK29qiMyehcdE4ugz0HA@mail.gmail.com">
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            <div>Hi</div>
            <div>I know Ubuntu16.04 is a bit old for QGIS now but since
              our software is all built on Ubuntu16.04 so I tried to
              install QGIS 3.x on it. Below is my tries but with no
              luck. Any help?<br>
            </div>
            <div><b><br>
              </b></div>
            <div><b>1. using <a href="https://qgis.org/ubuntugis"
                  moz-do-not-send="true">https://qgis.org/ubuntugis</a>
                repository</b><br>
              <span style="color:rgb(0,0,255)">$ sudo apt install qgis
                python3-qgis qgis-plugin-grass</span><br>
              Reading package lists... Done<br>
              Building dependency tree       <br>
              Reading state information... Done<br>
              E: Unable to locate package python3-qgis<br>
              <br>
              <span style="color:rgb(0,0,255)">$ sudo apt install qgis
                python-qgis qgis-plugin-grass</span><br>
              The following packages have unmet dependencies:<br>
               qgis-plugin-grass : Depends: +grass760 but it is not
              installable<br>
              E: Unable to correct problems, you have held broken
              packages.<br>
              <br>
              <b>2. using <a
                  href="http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu"
                  moz-do-not-send="true">http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu</a></b><br>
              <span style="color:rgb(0,0,255)">$ sudo apt install qgis
                python3-qgis qgis-plugin-grass</span><br>
              Setting up qgis-providers (3.4.6+dfsg-1~xenial1) ...<br>
              /usr/lib/qgis/crssync:
              /usr/local/cuda-8.0/targets/x86_64-linux/lib/libOpenCL.so.1:
              no version information available (required by
              /usr/lib/libqgis_core.so.3.4.6)<br>
              /usr/lib/qgis/crssync:
              /usr/local/cuda-8.0/targets/x86_64-linux/lib/libOpenCL.so.1:
              no version information available (required by
              /usr/lib/libqgis_core.so.3.4.6)<br>
              /usr/lib/qgis/crssync:
              /usr/local/cuda-8.0/targets/x86_64-linux/lib/libOpenCL.so.1:
              no version information available (required by
              /usr/lib/libqgis_core.so.3.4.6)<br>
              /usr/lib/qgis/crssync: relocation error:
              /usr/lib/libqgis_core.so.3.4.6: symbol
              clCreateCommandQueueWithProperties, version OPENCL_2.0 not
              defined in file libOpenCL.so.1 with link time reference<br>
              dpkg: error processing package qgis-providers
              (--configure):<br>
               subprocess installed post-installation script returned
              error exit status 127<br>
              <span style="color:rgb(0,0,255)"><br>
                $ sudo apt install qgis python-qgis qgis-plugin-grass</span><br>
              The following packages have unmet dependencies:<br>
               python-qgis : Depends: python-qgis-common (=
              2.18.28+dfsg-1~xenial1) but it is not going to be
              installed<br>
              E: Unable to correct problems, you have held broken
              packages.<br>
            </div>
            <div><br>
            </div>
            <div>Best regards,</div>
            <div>Zhang Qun<br>
            </div>
          </div>
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