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Dear QGIS community,<br>
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I have two questions : Do you know how to install easily pcraster on ubuntu ? How can I uninstall the latest version of QGIS 3.24 and get an older version of QGIS on ubuntu ?</p>
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Situation : I am a recent ubuntu user and I need to install pcraster for advanced watershed calculations. Apparently it is possible to install it using anaconda-navigator, so I first needed to install anaconda using this tutorial : <a href="https://gisunchained.wordpress.com/2019/05/29/using-qgis-from-conda/" target="_blank" rel="noopener noreferrer" class="x_OWAAutoLink" id="LPlnk610391" previewremoved="true">https://gisunchained.wordpress.com/2019/05/29/using-qgis-from-conda/</a>.
But once QGIS 3.18.3 installed and opened, any plugin utilization do not work at all. For example, applying strahler order tool from SAGA on a DEM does not work. Every time, the python error is :</p>
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<p><span style="white-space:pre-wrap; font-size:12pt; color:rgb(220,125,0)">WARNING </span><span style="white-space:pre-wrap; font-size:12pt">Traceback (most recent call last):</span></p>
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<p style="margin-right:0px; margin-left:0px; white-space:pre-wrap">File "/home/raphael/anaconda3/envs/demonstration/share/qgis/python/plugins/processing/gui/AlgorithmDialog.py", line 194, in runAlgorithm</p>
<p style="margin-right:0px; margin-left:0px; white-space:pre-wrap"><span style="font-size:12pt">self.cancelButton().setEnabled(self.algorithm().flags() & QgsProcessingAlgorithm.FlagCanCancel)</span></p>
<p style="margin-right:0px; margin-left:0px; white-space:pre-wrap"><span style="font-size:12pt"></span><span style="font-size:12pt">TypeError: setEnabled(self, bool): argument 1 has unexpected type 'Flags'</span></p>
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<span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">Thus I tried to install QGIS 3.24 via this link </span><a href="https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu" target="_blank" rel="noopener noreferrer" class="x_OWAAutoLink" id="LPlnk736128" style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px" previewremoved="true">https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu</a><span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px"> to
see if the problem can be resolved with a more recent version. The problem is that this tutorial is not for a conda environment, so now I want to uninstall 3.24 to go to an older and more stable version </span><span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:12pt">and
I don't know how to do it. If I install and uninstall QGIS, the version 3.24 still appears. Moreover, I still don't have pcraster installed and operational which I need the most.<br>
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Thank you in advance for your precious answer and have a good night!<br>
<br>
Raphaël</span><span id="ms-rterangepaste-end"></span><br>
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