xfce4-mixer-4.6.1-alt2

The mixer applet is running, but there is an empty place instead of an icon on the panel.

Perhaps something is missing, but I expect "apt-get install" to install everything necessary for a program.

Here is a list of my Xfce-related and icon-related packages:

$ rpm -qa '*xf*'
xfce4-dict-plugin-0.3.0-alt1
xfce4-smartbookmark-plugin-0.4.2-alt1
xfce4-genmon-plugin-3.2-alt1
xfce4-netload-plugin-0.4.0-alt1
xfce4-mailwatch-plugin-1.0.2-alt0svn3751
xfce4-fsguard-plugin-0.4.2-alt1
libXxf86misc-1.0.1-alt2
xfce-settings-desktop-network-0.6-alt1
xfce4-cddrive-plugin-0.0.1-alt1
xfce4-gsynaptics-plugin-1.0.0-alt1.1
xfce4-taskmanager-0.4.1-alt1
xfprint-4.6.1-alt2
gnome-vfs-obexftp-0.4-alt1
xfce4-notes-plugin-1.6.3-alt1
xfce4-panel-4.6.1-alt0.M50.2
xfsprogs-2.10.1-alt1
xfce4-icon-theme-4.4.3-alt1
xfce4-systemload-plugin-0.4.2-alt1.1
xfce-mousepad-0.2.14-alt1
xfce4-timer-plugin-0.6.1-alt1
xfce4-session-engines-4.6.1-alt1
libxfs-2.10.1-alt1
xfce4-smartpm-plugin-0.4.0-alt1
xfce4-diskperf-plugin-2.2.0-alt1
libxfcegui4-4.6.1-alt0.M50.2
xfce4-session-4.6.1-alt1
xfce4-xkb-plugin-0.5.3.3-alt1
fonts-ttf-latex-xft-0.1-alt4
libobexftp-0.22-alt2
xfsinfo-1.0.2-alt2
xf86dga-1.0.2-alt1
xfce4-places-plugin-1.0.0-alt1
xfcalendar-4.6.1-alt1
xfce4-xfmpc-0.0.7-alt1
xfce4-wmdock-plugin-0.2.0-alt1
xfce4-eyes-plugin-4.4.0-alt1
xfce4-mpc-plugin-0.3.3-alt1
xfconf-utils-4.6.1-alt2
xfce4-clipman-plugin-0.8.1-alt1
xfce4-datetime-plugin-0.6.1-alt1
xfce4-power-manager-0.8.1-alt1
libgtk-engines-xfce4-2.4.0-alt0.2
xfce4-cpugraph-plugin-0.4.0-alt1
xfdesktop-4.6.1-alt2
xfce-settings-desktop-0.6-alt1
xfce-mcs-manager-4.4.3-alt1
xfd-1.0.2-alt1
libXxf86vm-1.0.2-alt2
xfce4-minimal-4.6-alt1
obexftp-0.22-alt2
xfce4-appfinder-4.6.1-alt2
libxfconf-4.6.1-alt2
xfce-utils-4.6.1-alt4
xorg-x11-xfs-1.0.6-alt1
libxfce4util-4.6.1-alt1
xfce4-weather-plugin-0.6.2-alt1
xfce-mcs-plugins-4.4.3-alt1
libxfce4mcs-4.4.3-alt1
xfce4-radio-plugin-0.4.0-alt1
xfce4-cpufreq-plugin-0.2-alt0svn3751
xfce4-mixer-4.6.1-alt2
xfce4-battery-plugin-0.5.1-alt1
xfce4-xmms-plugin-0.5.1-alt1
xfce4-xfapplet-plugin-0.1.0-alt1
xfce4-quicklauncher-plugin-1.9.4-alt1
xfontsel-1.0.2-alt2
xfce4-mount-plugin-0.5.5-alt1
xfce4-modemlights-plugin-0.1.3.99-alt1
fuse-obexfs-0.11-alt0.rc3
xfce4-time-out-plugin-0.1.1-alt1
xfce4-xfmedia-0.9.2-alt2.1
libxforms-1.0.90-alt1.1
xfce4-screenshooter-plugin-1.4.0-alt1
python-module-obexftp-0.22-alt2
libxfsm-4.6.1-alt1
libxfce4util-devel-4.6.1-alt1
xfce4-sensors-plugin-0.10.99.6-alt1
libXxf86dga-1.0.2-alt2
xfig-3.2.5_alpha5-alt8
xfce4-xfbib-0.0.2-alt1
libxfce4menu-4.6.1-alt1
libxfce4mcs-devel-4.4.3-alt1
xfce4-cellmodem-plugin-0.0.5-alt1.1
xfce4-terminal-0.2.8.3-alt1
xfwm4-4.6.1-alt2
$ rpm -qa '*icon*'
icons-BlueSphere-0.3.0-alt5
icon-theme-mist-2.26.1-alt1
quodlibet-plugin-trayicon-0-alt2.1
qmmp-statusicon-0.2-alt0.1.svn376
alterator-icons-default-0.2-alt1
xfce4-icon-theme-4.4.3-alt1
icon-theme-crux-2.26.1-alt1
gnome-icon-theme-2.26.0-alt1
tango-icon-theme-extras-0.1.0-alt1
fvwm-icons-2.5.16-alt3
icon-theme-gnome-colors-wine-3.6-alt1
ruby-module-iconv-1.8.7-alt7
icon-theme-gnome-colors-noble-3.6-alt1
tango-icon-theme-0.8.90-alt1
gnome-icon-themes-crystal-1.0-alt1
gnome-icon-themes-old-1.0-alt2
icon-themes-accessibility-2.26.1-alt1
menu-icons-default-0.1-alt2
muine-plugin-trayicon-0.8.10-alt2
icon-theme-gnome-colors-wise-3.6-alt1
icon-naming-utils-0.8.90-alt1
iconv-2.9-alt3
icon-theme-gnome-colors-brave-3.6-alt1
gnome-icon-themes-extra-1.0-alt2
icon-theme-hicolor-0.5-alt1
gnome-icon-themes-industrial-0.2.36-alt1
$