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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