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Kewal Shah
Asked: 2019-04-25 11:29:27 +0800 CST

Cannot open pdf files in mounted usb drive using Okular

  • 772

Whenever I try opening a PDF file in a mounted usb drive using Okular, it gives me this error: Could not open file:///media/walkeknow/F8A2-34D9/example.pdf

Okular error dialog

I have installed okular using sudo snap install okular because the apt-get method does not render the in-app icons for some reason on my system.

which okular command gives: /snap/bin/okular

The files open using Ubuntu's default Document Viewer evince. However I prefer using Okular. Is there any fix to this?

usb-drive okular

2 Answers

  1. Best Answer

    Snap problem

    Okular does not support removable media while installed as Snap. You should remove it

    snap remove okular

    In other words it does not support snap connect okular:removable-media plug.

    Okular from APT (deb-package)

    Installation

    Then install deb-packaged version instead with

    sudo apt-get install okular

    Set-up look and feel

    To get normal look and feel you need to install Breeze KDE theme with

    sudo apt-get install breeze qt5ct

    and select it from qt5ct with

    QT_QPA_PLATFORMTHEME=qt5ct qt5ct

    then switch to Icon Theme tab and select Breeze here and hit Save:

    qt5ct

    To make changes permanent add this line to your ~/.profile with

    echo "export QT_QPA_PLATFORMTHEME=qt5ct" >> ~/.profile

    then reboot and use Okular with files from anywhere:

    Okular on Ubuntu 18.04 LTS with GNOME

    Note: I tested the method above on Ubuntu 18.04 LTS with GNOME Shell and MATE.

    • 2
    1. Goto ubuntu's software manager.
    2. Goto Installed.
    3. Locate Okular and press it.
    4. Change the permissions to "read/write files on removable device".
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