It has been a while since I've used it myself (I tend to dual-boot or run windows with Basecamp in a VM if the device is fast enough), but QTLandkarte-GT is definitely the right choice for Linux.
What have you tried so far? I am not sure you can load maps from a device directly into QTLandkarte like Basecamp does. But if you got your OSM maps from garmin.openstreetmap.nl there should have also been a zip file with all the map tiles. That's what you need for QTLandkarte. Unzip it into a seperate directory somewhere and open the .tdb file from the software and in the second step of loading the maps, select the file with the same name as the tdb but an _mdr.img extension. That should make the entire map visible.
Also make sure you're on the latest version of QTLandkarte.
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