On my xubuntu I have this horrible software heading:
I want to remove it. A post said to download xfce-theme-manager, so I did everything I had to do:
sudo add-apt-repository ppa:rebuntu16/other-stuff
sudo apt update
sudo apt-get install xfce-theme-manager
When I try to install xfce theme manager I get an error along the lines of xfce-theme-manager doesn't exist
(My language is Italian, so I don't know the exact translation)
Detail: I use gtk themes
What can I do to install xfce-theme-manager or at least, not having those software headings anymore?
It appears that you want to change the theme of your window manager. For that, you do not have to install any extra software.
Click on the mouse icon (or the menu icon) usually located at the left end of your panel). In the window that opens, click on Settings in the right pane and then scroll down to window manager in the left pane.
You'll get a new window titled Window Manager. Click on the Style tab. The "software heading" will change depending on the theme you choose in the left pane. You can make other changes there as well. In the next image, I've chosen Numix.
And this is what the Greybird theme looks like (and it resembles the image you posted):
Get it here: https://github.com/KeithDHedger/Xfce-Theme-Manager/releases
Unpack, then cd into the folder and execute following commands:
et voila, you have the XFCE Theme manager in your menu