$ sudo apt-get purge alsa-base alsa-utils anacron bc ca-certificates dmz-cursor-theme doc-base fonts-dejavu-core fonts-freefont-ttf foomatic-db-compressed-ppds genisoimage ghostscript-x gtk2-engines-pixbuf inputattach language-selector-gnome libasound2-plugins libpam-systemd libsasl2-modules libxp6 lightdm lightdm-gtk-greeter memtest86+ openprinting-ppds pm-utils printer-driver-pnm2ppa rfkill software-properties-gtk thunar thunar-volman tumbler ubuntu-drivers-common ubuntu-extras-keyring unzip update-manager wireless-tools wpasupplicant xdg-user-dirs xdg-user-dirs-gtk xfce4-appfinder xfce4-notifyd xfce4-panel xfce4-session xfce4-settings xfdesktop4 xfwm4 xkb-data xorg xterm xubuntu-artwork xubuntu-default-settings zenity zip
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'thunar' is not installed, so not removed
Package 'thunar-volman' is not installed, so not removed
Package 'tumbler' is not installed, so not removed
Package 'xfce4-appfinder' is not installed, so not removed
Package 'xfce4-notifyd' is not installed, so not removed
Package 'xfce4-panel' is not installed, so not removed
Package 'xfce4-session' is not installed, so not removed
Package 'xfce4-settings' is not installed, so not removed
Package 'xfdesktop4' is not installed, so not removed
Package 'xfwm4' is not installed, so not removed
Package 'xubuntu-default-settings' is not installed, so not removed
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 qtdeclarative5-qtfeedback-plugin : Depends: libqt5feedback5 but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.