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While messing around with Lubuntu 19.04, running lxqt-sudo to launch Pluma text editor as root so that I could edit the /var/www PHP projects I had, I noticed when rightclicking the file browser pane and choosing View Folder, that it opened up, at first, PCManFM-Qt. However, when it did so, it used a very ugly theme. (That's another question I have posted.) Then, I installed Nautilus. When I did, now when I open Pluma as root, it uses some file manager called Files, which I assume is Nautilus because it shows up when I do ps -ef | grep -i nautilus.

How do I tell Pluma to use PCManFM-Qt instead of Nautilus? What config file do I edit?

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Setting the default is done with:

xdg-mime default pcmanfm-qt.desktop inode/directory application/x-gnome-saved-search

(I assumed it is pcmanfm-qt.desktop so do check for the actual .desktop file inside /usr/share/applications folder.)

  • nautilus.desktop for Nautilus.
  • nemo.desktop for nemo.
  • etc.

when I open Pluma as root

Please stop this behaviour. Use pkexec instead.

But even then don't! If you need root to edit files in /var/www/ your files are set incorrectly. Check the group of those files and add your user to that group. The group is going to be either www-data or apache if you use apache. Then you can edit the files from your user.

  • Note currently when I type xdg-mime query default inode/directory, it returns with org.gnome,Nautilus.desktop when in sudo su (root). But as a regular user, it returns with pcmanfm-qt.desktop. Perhaps this is useful info to someone. – Volomike May 2 at 6:23
  • As for pkexec, I'm glad you pointed out that tool to me. I had not seen it before. I really just need to edit the PHP files as the www-data user context. I haven't figured out how to make that work just yet -- it says Cannot open display:. Currently my launcher is using lxqt-sudo to launch Pluma as root, and being asked for my login password on lxqt-sudo is annoying when it's just my local desktop. – Volomike May 2 at 6:26
  • see the addition ;-) – Rinzwind May 2 at 6:44
  • Thanks on that. Also, I found this which explains how to get around the Cannot open display and No protocol specified problems. – Volomike May 2 at 6:56

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