OS: ubuntu 20.04

At the time, the latest Obsidian version is 1.8.9.

Problem

Using the latest Obsidian downloaded from snap, I find that I can't view some PDFs in obsidian vault. But those PDFs can be viewed normally in any other PDF viewers.

Solution

Step 1:

Remove the snap version of Obsidian.

snap remove obsidian

Step 2

Download the deb version of obsidian. (Downlaod page of Obsidian)

Run the following command to install it.

sudo apt install <the-deb-file-path>

For example, in the download folder,
run sudo apt install ./obsidian_1.8.9_amd64.deb

Result

All PDFs can be view normally in Obsidian.