More on the same:
After the recent GRASS update, the GRASS modules in Processing Toolbox no longer worked, giving the error "cannot find grass". My work around is to set a softlink:
sudo ln -s /usr/bin/grass72 /usr/bin/grass70
Then the GRASS modules work.

There used to be a Processing configuration option to set the path for different modules. But that seems to be gone now?? So is Processing checking for the GRASS startup script hardcoded to /usr/bin/grass70? How can I change that?


On 01/13/2017 07:10 PM, Stephane Goldstein wrote:
Hi.

This also started happening to me after upgrading to 2.18.2.
If you open QGIS in the command line, then try to run a GRASS tool from Processing, you will probably see a message saying that it couldn't find grass70.

Because you're using ubuntugis-unstable, you probably have GRASS 7.2, so this should be the reason fro the error.

Switching from ubuntugis-unstable to ubuntugis-stable, which has GRASS 7.0, did the trick for me.

Not sure if there is another way to fix this while using ubuntugis-unstable / GRASS 7.2, without compiling QGIS from source.

Any ideas ?


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