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I updated to QGIS 3.4 on Ubuntu, but there are some functions that are not working so I want to downgrade. Therefore, I have several questions:

  1. How to downgrade or reinstall to some older version easily?
  2. A safe, standard and easy way to install multiple QGIS versions on Ubuntu?

Please Note: I have investigated a few similar questions but they are old and related to QGIS 2, nevertheless, QGIS 3 has significant changes.

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    It depends on which QGIS and Ubuntu version you want to run. QGIS 2.18 is still available as LTR, but QGIS 3.0 and 3.2 might need self-compiling once the packages have been updated. You can only have multiple QGIS versions on Ubuntu using virtual boxes or dockers. – AndreJ Nov 28 '18 at 8:35
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    apt-cache policy qgis shows you what you can get from packages. – AndreJ Nov 28 '18 at 8:44
  • You can install QGIS 2.18.25 from NextGIS PPA (launchpad.net/~nextgis/+archive/ubuntu/ppa/+packages). See gis.stackexchange.com/a/287941/9904. This version works with QGIS 3 on same PC. – Dmitry Baryshnikov Nov 28 '18 at 9:06

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