How do I get icons for Thunar in 18.04?

Question

After upgrading from 16.04 to 18.04 (keeping my home folder) Thunar looks like this in an i3 session:

Apparently some icons are missing, but what do I have to install?

Note that the accepted answer of this older question is obsolete since package gnome-icon-theme-full does not exist anymore. xfce4-settings-helper doesn't seem to exist anymore, either.

Answer 1

The approach from hrzhu's answer still works:

• Install lxappearance.
• Run it and pick a working icon theme.
  Note how the default, Adwaita, seems to be broken.
• Restart Thunar.

Answer 2

I provided the same answer earlier for a similar question, with i3 on Xubuntu 18.04 this worked for me:

1. Create/modify the file .gtkrc-2.0 in your home directory
2. Add/edit the line gtk-icon-theme-name="gnome", change gnome to your desired icon theme.

This can be done by executing echo "gtk-icon-theme-name=\"gnome\"" >> ~/.gtkrc-2.0 in your terminal.

Credit: https://www.linuxquestions.org/questions/slackware-14/no-icons-in-thunar-when-running-out-of-xfce-4175469261/#post4988339

Answer 3

I came to this topic because I didn't like the new green icon for the download folder. So I did a research to fix it, I mean, to have the blue download icon back in my system.

Luckly I had a notebook with this blue icon and I found the exact path and file to change it. This icon is loaded from /usr/share/icons/elementary-xfce/places/16

Later I got excited and changed the Pictures icon too. See the result:

How to do it

1- Download the icon from here using mouse right button on the icon, option Save Image ->

2- Open a terminal, and copy it to the right folder, supposing you saved the icon in ~/Downloads:

sudo cp  ~/Downloads/iQWdf.png /usr/share/icons/elementary-xfce/places/16/folder-downloads.png
sudo cp  ~/Downloads/QyNBX.png /usr/share/icons/elementary-xfce/places/16/folder-pictures.png