I have been using QGIS on Windows 10, but now have installed Ubuntu (20.04.2) on a high spec laptop and want to use QGIS on that instead.

I installed QGIS 3.18; SAGA was not installed with it. sudo apt install SAGA gave me version 7.3.0 - and a message SAGA version 7.3.0 is not officially supported - algorithms may encounter issues when I try to run anything from SAGA. And I did encounter issues, sadly.

I would like to install a version of SAGA which is supported - but an hour of searching both here and elsewhere has not brought me the answer. I can't say for sure that's not my fault - maybe I'm missing something obvious - but I can't find it. My Windows 10 QGIS has SAGA 2.3.2, but sudo apt install saga=2.3.2 just returns E: Version '2.3.2' for 'saga' was not found.

I am one of those users of Ubuntu who might be classed in the "A little knowledge is a dangerous thing" category - I've been using it on and off for years, but I probably feel like I know a lot more than I actually do, so maybe there's an obvious solution that I'm missing. But I just want to have QGIS with working SAGA on this machine and I can't find what I need to make that happen.

1 Answer 1


The answer lies in the source code (../python/plugins/processing/algs/saga/SagaAlgorithmProvider.py) on lines 43-44.


The officially supported version of SAGA for QGIS 3.18 is 2.3.x.

You could try compiling SAGA 2.3.x from source.

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