If you are using Windows you can install alongside a previous version by
placing it in a different path.
If using Linux the below applies as there can only be one installation
in a system at a time.
The library names may be the same and if so you can get error messages
that the software needs 3.4 libraries but the system will only provide
2.12 libraries due to them already being installed previously.
If you see a message like that then manually remove the component that
requires the library and then use apt autoremove to remove as many
dependencies as possible
The messages looks something like
/<package name> requires <dependency> but it is not going to be installed/
/<package name> requires <dependency> but <different version> is installed/
/Unable to install... you have held broken packages./
You should at least:
apt remove qgis python-qgis qgis-plugin-grass
apt autoremove
apt update
apt install qgis
then see what messages you get. Remove additional packages as necessary
and repeat.
On 3/12/18 4:11 PM, Peter Kroopnick wrote:
I am about to upgrade from 2.12 to 3.4. Do I have to UNINSTALL the
2.12 first? Will the 3.4 install over the top of 2.12?
Thankyou
Pete Kroopnick
2457 Desert Willow Dr.
Prescott, AZ 86301
Home: 928-227-0223
Cell: 602-628-3351
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