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Is there a way in QGIS to transform a Polygon layer (shapefile) to a Line layer through "Virtual Layers"? In case there is how could I in addition to making the conversion also avoid duplicate geometries in this virtual layer, so that polygons that share boundaries with each other will generate only a single line when converted to lines?

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    It is not straight but it is possible, check this gis.stackexchange.com/a/382382 for instance, there one step forward was done, so you need to get the interior and exterior rings (depends whether your polygons posses holes). However, I want to ask why do you want to make your life a bit more complicated when QGIS/GRASS geoalgorithms are marvelous for solving exactly your problem?
    – Taras
    Jun 2, 2021 at 18:23

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You will get best results if you install Grass GIS together with QGIS and use the processing tool v.to.lines.

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