[Qgis-user] Install QGIS 3.x on Ubuntu16.04

[Patrick Dunford]

If you have previously installed 2.18 and trying to upgrade you need to 
remove as many of the old packages first.

After uninstalling Qgis 2.18 use apt autoremove to clear off all the old 
2.18 packages.

On 23/04/19 3:13 PM, Zhang Qun wrote:
> Hi
> 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?
> *
> *
> *1. using https://qgis.org/ubuntugis repository*
> $ sudo apt install qgis python3-qgis qgis-plugin-grass
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> E: Unable to locate package python3-qgis
>
> $ sudo apt install qgis python-qgis qgis-plugin-grass
> The following packages have unmet dependencies:
>  qgis-plugin-grass : Depends: +grass760 but it is not installable
> E: Unable to correct problems, you have held broken packages.
>
> *2. using http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu*
> $ sudo apt install qgis python3-qgis qgis-plugin-grass
> Setting up qgis-providers (3.4.6+dfsg-1~xenial1) ...
> /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)
> /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)
> /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)
> /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
> dpkg: error processing package qgis-providers (--configure):
>  subprocess installed post-installation script returned error exit 
> status 127
>
> $ sudo apt install qgis python-qgis qgis-plugin-grass
> The following packages have unmet dependencies:
>  python-qgis : Depends: python-qgis-common (= 2.18.28+dfsg-1~xenial1) 
> but it is not going to be installed
> E: Unable to correct problems, you have held broken packages.
>
> Best regards,
> Zhang Qun
>
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