<div dir="ltr">Hi Andre,<div><br></div><div><font color="#000000">Okay thanks once again... I'll have a go, though I'm not sure how to remove them. Would it be '<font face="monospace">sudo apt-get remove gdal-bin</font>' or does it need '<font face="monospace">sudo apt-get remove gdal-bin 3.0.2+dfsg-1~bionic2</font>'? I ask because I don't know if gdal-bin is something generic used elsewhere and I have to denominate that. As I don't really understand what those files are, I'm wary of removing them without being sure of the syntax first. Can I be sure they aren't needed for another program, for example Blender? </font></div><div><br></div><div>So once those four files are removed I can try <font face="monospace">sudo apt-get install libgdal20=2.2.3+dfsg-2 </font><font face="arial, sans-serif">again? And once I have libgdal20 installed then I can run </font><font color="#000000" face="monospace">sudo apt-get install qgis qgis-plugin-grass python3-qgis</font><span style="color:rgb(80,0,80)">?</span><font color="#000000"> If I'm missing anything else then please let me know..</font></div><div><font color="#000000"><br></font></div><div><font color="#000000">Cheers,</font></div><div><font color="#000000">Jimi.</font></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 28, 2020 at 7:27 PM Andre Joost <<a href="mailto:andre%2Bjoost@nurfuerspam.de">andre+joost@nurfuerspam.de</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">Am 28.02.20 um 18:29 schrieb J. M:<br>
<br>
> Here's what I get:<br>
> sudo apt-get remove libgdal20<br>
> [sudo] password for jimi:<br>
> Reading package lists... Done<br>
> Building dependency tree<br>
> Reading state information... Done<br>
> Package 'libgdal20' is not installed, so not removed<br>
<br>
That was expected, because apt-cache policy libgdal20 already told you <br>
that it was not installed.<br>
<br>
> jimi@jimi-System-Product-Name:~$ dpkg -l | grep gdal<br>
> ii gdal-bin 3.0.2+dfsg-1~bionic2<br>
> amd64 Geospatial Data Abstraction Library -<br>
> Utility programs<br>
> ii gdal-data 3.0.2+dfsg-1~bionic2<br>
> all Geospatial Data Abstraction Library - Data<br>
> files<br>
> ii libgdal26 3.0.2+dfsg-1~bionic2<br>
> amd64 Geospatial Data Abstraction Library<br>
> ii python3-gdal 3.0.2+dfsg-1~bionic2<br>
> amd64 Python 3 bindings to the Geospatial Data<br>
<br>
<br>
These are still GDAL 3.02 packages that you installed with the ubuntugis <br>
PPA. Get rid of those, otherwise you will not get further.<br>
<br>
><br>
> I'm still not clear about what the ubuntugis PPA is needed for, or what<br>
> gdal even is..<br>
<br>
GDAL is more or less the heartbeat of QGIS. Almost every operation uses <br>
it. For some reason, you must use exactly the same GDAL version as the <br>
QGIS package is compiled against. For bionic (without ubuntugis), this <br>
is GDAL 2.2.3. The gdal-abi package is used to confirm that version.<br>
<br>
With the Ubuntugis PPA, you have installed a newer version of GDAL <br>
(3.0.2), and the packet manager does not downgrade it by itself (it does <br>
not know about th specific QGIS requirements).<br>
<br>
<br>
HTH,<br>
Andre Joost<br>
<br>
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