The dom0 of QubesOS Version 4.2.4 (latest stable at the time of this writing: May 31st, 2025) is based on Fedora-37. The repositories of Fedora-37 seem not include a package xfce4-notes-plugin. Therefore any attempt adding this using the comand:
sudo dnf install xfce4-notes-plugin
will fail with the error message Error: Unable to find a match: xfce4-notes-plugin. However adding this package to any template qube doesn’t work either, because the added notes do not reappear automatically after a session restart. Any suggestions how to solve this?
Just to confirm, did you make sure to shut down the template after installing the package, then (re)start the app qube? In other words:
Install package in template.
Shut down template.
If app qube based on template is running, restart it.
Also, based on the description, it sounds like you might need an Xfce4 panel running in the app qube in order for this plugin to appear or work, but I’m not familiar with this particular plugin.