When you receive PDF files in Telegram Desktop, you might be disappointed when it opens in the wrong application not in your PDF reader. For example, in Kubuntu, it wrongly opens PDF with LibreOffice Draw, while it should be Okular. In other cases, it may instead opens PDF with web browser. We will show you how to fix this issue quickly. 

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Notes

Okular is PDF viewer on Kubuntu.

Evince (Document Viewer) is PDF viewer on Ubuntu.

On Kubuntu KDE

1. Find a PDF file in your folders. 

2. Right-click the file > Properties > Open with: Change.

3. Delete, except Okular, all other applications under Application Preference Order.

4. OK. 

5. Test opening PDF in Telegram.

On Ubuntu GNOME

1. Find a PDF file in your folders. 

2. Right-click the file > Properties > Open With.

3. Select Evince (Document Viewer) as default.

4. OK . 

5. Test opening PDF in Telegram.