restaurar o painel por omissão no lxde
rm -r ~/.config/lxpanel
lxpanelctl restart
rm -r ~/.config/lxpanel
lxpanelctl restart
adicionar a linha:
"flat-volumes = no" ao ficheiro /etc/pulse/daemon.conf
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=918463;msg=7
dpkg -l | grep .xfce. | awk '{print $2}' | xargs apt-get purge -V --auto-remove -yy
https://mxlinux.org/wiki/xfce/how-to-completely-remove-xfce/