Carunga

Try Zotero. It is a complete literature databas but it's PDF reader is very good at extracting images and text. Works on all OS, web and mobile. Native Linux client has been very smooth for me. Oh, terminal it doesn't do though. If you want to extract a large amount in an automated way, its probably not the right tool.

Did not know this. Immutable Ubuntu plus flatpack sounds awesome. Not sure what to think about their plans to fork cosmic from GNOME.

Turns out she needs a bit of proprietary software (pixum for photo books) that I could not install on EndlessOS. So I had to change course and installed pop os. So far I am pleasantly suprised. Even though I thought I would not like it, their take on GNOME makes sense to me. Tiling is fun.