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    <p>thanks chris for your help. I tried your suggestion, I was able to install Qgis but interestingly as I launched it I got immediatly the error message 
</p>
    <p>Couldn't load plugin 'crayfish' due to an error when calling its initGui() method 

AttributeError: module 'pyqtgraph' has no attribute 'GraphicsWindow' 
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/qgis/utils.py", line 448, in startPlugin
    plugins[packageName].initGui()
  File "/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python/plugins/crayfish/plugin.py", line 96, in initGui
    w = CrayfishPlotWidget(self.plot_dock_widget)
  File "/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python/plugins/crayfish/gui/plot_widget.py", line 186, in __init__
    self.gw = pyqtgraph.GraphicsWindow()
AttributeError: module 'pyqtgraph' has no attribute 'GraphicsWindow'


Python version: 3.8.10 (default, Nov 22 2023, 10:22:35) [GCC 9.4.0] 
QGIS version: 3.26.3-Buenos Aires Buenos Aires, 65e4edfdad 

Python Path:
/usr/share/qgis/python
/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python
/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python/plugins
/usr/share/qgis/python/plugins
/usr/lib/python38.zip
/usr/lib/python3.8
/usr/lib/python3.8/lib-dynload
/usr/local/lib/python3.8/dist-packages
/usr/lib/python3/dist-packages
/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python
/home/kermarrec/.local/share/gis4wrf/python38/local/lib/python3.8/site-packages
/home/kermarrec/.local/share/gis4wrf/python38/lib/python3/site-packages
/home/kermarrec/.local/share/gis4wrf/python38/lib/python3.8/site-packages
.
/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python/plugins/vrtbuilderplugin
/home/kermarrec/.local/share/QGIS/QGIS3/profiles/default/python/plugins/vrtbuilderplugin/vrtbuilder</p>
    <p>I have no idea what I could do to solve the problem.</p>
    <p>gael.
</p>
    <p>
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    <div class="moz-cite-prefix">On 12/12/23 18:36, chris hermansen
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CACc2_6_UMhZR3oW_ETc-JqxaG-6Sj_P5miPSsdkDzkPyT4AL-A@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div>
          <div dir="ltr">Gael and list,<br>
          </div>
          <br>
          <div class="gmail_quote">
            <div dir="ltr" class="gmail_attr">On Tue, Dec 12, 2023 at
              8:03 AM Gael Kermarrec via QGIS-User <<a
                href="mailto:qgis-user@lists.osgeo.org"
                moz-do-not-send="true" class="moz-txt-link-freetext">qgis-user@lists.osgeo.org</a>>
              wrote:<br>
            </div>
            <blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear
              members,<br>
              <br>
              I am trying to install Qgis from Ubuntu 20.04 but
              everytime I make sudo <br>
              apt install qgis qgis-plugin-grass I become the following:<br>
              <br>
              <br>
              The following packages contain unsatisfied dependencies:<br>
              qgis: Depends on python3-qgis (= 1:3.22.16+32focal) but <br>
              1:3.26.3+32focal-ubuntugis needs to be installed<br>
              Depends on qgis-providers (= 1:3.22.16+32focal) but <br>
              1:3.26.3+32focal-ubuntugis needs to be installed<br>
              Depends on qgis-common (= 1:3.22.16+32focal) but <br>
              1:3.26.3+32focal-ubuntugis needs to be installed<br>
              qgis-plugin-grass: Depends on qgis-plugin-grass-common (=
              <br>
              1:3.22.16+32focal) but 1:3.26.3+32focal-ubuntugis needs to
              be installed<br>
              Depends on grass782<br>
              E: Unable to correct problems, defective packages are in
              "keep in the <br>
              current state" mode.<br>
              <br>
              I have no idea what I should do to make it works. Maybe
              somebody had the <br>
              same problem, I would be grateful to get some support as I
              would like to <br>
              work with QGis.<br>
              <br>
            </blockquote>
            <div>It looks as though you might be trying to work with the
              ubuntugis PPA.  If that's so, maybe you should consider
              trying the suggested methodology on the QGIS site here:</div>
            <div><br>
            </div>
            <div><a
href="https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu"
                moz-do-not-send="true" class="moz-txt-link-freetext">https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu</a><br>
              <br>
              If you just want to correct the unsatisfied dependencies,
              it's probably worth trying your command again with the
              "-f" option:</div>
            <div><br>
            </div>
            <div> apt install -f qgis qgis-plugin-grass</div>
          </div>
          <br clear="all">
        </div>
        <div>In any event, I suggest you read this useful mini-tutorial
          on fixing unsatisfied dependencies.</div>
        <div><br>
        </div>
        <div><a
href="https://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa"
            moz-do-not-send="true" class="moz-txt-link-freetext">https://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa</a></div>
        <div><span class="gmail_signature_prefix">-- </span><br>
          <div dir="ltr" class="gmail_signature">
            <div dir="ltr">Chris Hermansen · clhermansen "at" gmail
              "dot" com<br>
              <br>
              C'est ma façon de parler.</div>
          </div>
        </div>
      </div>
    </blockquote>
    <pre class="moz-signature" cols="72">-- 
-------********---------
Dr. Gael Kermarrec
Institute for meteorology and climatology
Leibniz Universität Hannover
Herrenhäuser Str. 2
D-30419 Hannover
Tel: +49 511 762 2679
Email: <a class="moz-txt-link-abbreviated" href="mailto:kermarrec@meteo.uni-hannover.de">kermarrec@meteo.uni-hannover.de</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.meteo.uni-hannover.de">www.meteo.uni-hannover.de</a></pre>
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