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<p>If you have previously installed 2.18 and trying to upgrade you
need to remove as many of the old packages first.</p>
<p>After uninstalling Qgis 2.18 use apt autoremove to clear off all
the old 2.18 packages.<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>
</div>
</div>
<br>
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