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<p>Hi Harrissou,</p>
<p>Sorry, I was just assuming that question was related to Windows
(where >90% of our user base is).</p>
<p>On Linux it is more complicated. To do that on Linux, I compile
QGIS from source myself. Than it is possible with different start
scripts that have different library paths.</p>
<p>There may be other ways to install both versions from binaries on
Linux that I am not aware of.</p>
<p>There were discussions about supporting Snap or flatpack packages
in the future - but they don't exist yet. This may be a way to
install both versions on Linux as well.<br>
</p>
<p>Andreas<br>
</p>
<br>
<div class="moz-cite-prefix">On 01.03.2018 10:48, DelazJ wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAECJsSq7MhczTKSKjHkVnjRdB0Ef=zQKxJsAeZgNbHMRq7vYZg@mail.gmail.com">
<div dir="ltr">Hi,<br>
<div class="gmail_extra"><br>
<div class="gmail_quote">2018-03-01 10:37 GMT+01:00 Andreas
Neumann <span dir="ltr"><<a
href="mailto:a.neumann@carto.net" target="_blank"
moz-do-not-send="true">a.neumann@carto.net</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi Strumbi,</p>
<p>They can be installed and run in parallel.</p>
</div>
</blockquote>
<div>Easily?<br>
I could do that on Windows or macOS but never succeeded on
Linux (tried with 2.14 and 2.18 in the past and ended up
with building from source the latest version, unless there
is a difference in 2.x vs 3.x).<br>
</div>
<div>What would then be the steps/requirements to use the
provided packages and build different versions of QGIS on
the same machine (nota: i'm still a beginner on Linux).<br>
<br>
</div>
<div>Thanks,<br>
</div>
<div>Harrissou<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p> They have independent settings.<br>
</p>
<p>The only restriction is: once you have saved a
project in QGIS 3, there may be no way back to 2.18.</p>
<p>The other thing to watch out is plugins or Python
code: plugins and Python code from QGIS 2.x don't run
in QGIS 3.x. They have to be revised because of the
change from Python 2 to Python 3 and qt4 to qt5. In
addition, the QGIS API changed considerably.
Theoretically, a plugin can be written to work in both
QGIS 2 and QGIS 3, but in practice, such plugins don't
exist very often.<br>
</p>
<p>Greetings,</p>
<p>Andreas<br>
</p>
<div>
<div class="h5"> <br>
<div class="m_-3788026693823976099moz-cite-prefix">On
<a href="tel:01%2003%2020%2018%2010"
value="+33103201810" target="_blank"
moz-do-not-send="true">01.03.2018 10</a>:22,
Velizar Strumberger wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<div dir="ltr">Hello
<div>I apologize if this question has been asked
already. Should I uninstall QGIS 2.18 before I
install QGIS 3.</div>
<div>Thank you</div>
<div>Strumbi </div>
</div>
<br>
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