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:
- How to downgrade or reinstall to some older version easily?
- 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.