I have the latest version of obsidian and ubuntu (22.04). These days I have been having problems because no pdf would open. Today I accidentally pressed the “help” button and it opened my default browser which is edge, but it was like unconfigured, then I had to “install” it and automatically some pdfs worked (it must have to do with the fact that my default pdf reader is edge), but many others did not.
I also have another vault where pdfs that don’t work in my vault 1, it exports them in vault 2.
Another thing, when I press “open in default application” it only opens the ones it exports and not the others, and it does not open them in my default application (which is edge), but it opens them in the ubuntu libre office application.