[Qgis-user] QGIS 2.18 vs. QGIS 3

[Andreas Neumann]

Hi Harrissou,

Sorry, I was just assuming that question was related to Windows (where 
 >90% of our user base is).

On Linux it is more complicated. To do that on Linux, I compile QGIS 
from source myself. Than it is possible with different start scripts 
that have different library paths.

There may be other ways to install both versions from binaries on Linux 
that I am not aware of.

There were discussions about supporting Snap or flatpack packages in the 
future - but they don't exist yet. This may be a way to install both 
versions on Linux as well.

Andreas


On 01.03.2018 10:48, DelazJ wrote:
> Hi,
>
> 2018-03-01 10:37 GMT+01:00 Andreas Neumann <a.neumann at carto.net 
> <mailto:a.neumann at carto.net>>:
>
>     Hi Strumbi,
>
>     They can be installed and run in parallel.
>
> Easily?
> I could do that on Windows or macOS but never succeeded on Linux 
> (tried with 2.14 and 2.18 in the past and ended up with building from 
> source the latest version, unless there is a difference in 2.x vs 3.x).
> What would then be the steps/requirements to use the provided packages 
> and build different versions of QGIS on the same machine (nota: i'm 
> still a beginner on Linux).
>
> Thanks,
> Harrissou
>
>     They have independent settings.
>
>     The only restriction is: once you have saved a project in QGIS 3,
>     there may be no way back to 2.18.
>
>     The other thing to watch out is plugins or Python code: plugins
>     and Python code from QGIS 2.x don't run in QGIS 3.x. They have to
>     be revised because of the change from Python 2 to Python 3 and qt4
>     to qt5. In addition, the QGIS API changed considerably.
>     Theoretically, a plugin can be written to work in both QGIS 2 and
>     QGIS 3, but in practice, such plugins don't exist very often.
>
>     Greetings,
>
>     Andreas
>
>
>     On 01.03.2018 10 <tel:01%2003%2020%2018%2010>:22, Velizar
>     Strumberger wrote:
>>     Hello
>>     I apologize if this question has been asked already. Should I
>>     uninstall QGIS 2.18 before I install QGIS 3.
>>     Thank you
>>     Strumbi
>>
>>
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