Comment 7 for bug 1768620

Thanks for bringing that bug report up. Unity should only be recommended for uninstallation on systems without universe enabled which is a rarity.

I verified this using the dist-upgrader tarball from bionic proposed:

2018-05-18 12:58:36,677 INFO release-upgrader version '18.04.18' started
....
2018-05-18 12:58:45,843 DEBUG Remove: account-plugin-facebook account-plugin-flickr account-plugin-google appmenu-qt5 apt-transport-https checkbox-converged checkbox-gui evolution-data-server-online-accounts gir1.2-totem-plparser-1.0 gnome-orca gnome-session-flashback gnupg-agent gnupg2 grilo-plugins-0.2-base hud imagemagick-common indicator-session kerneloops-daemon libabw-0.1-1v5 libbabeltrace-ctf1 libcurl3 libdata-alias-perl libdfu1 libdouble-conversion1v5 libgtk2-perl liblircclient0 libmagickcore-6.q16-2 libmagickcore-6.q16-2-extra libmagickwand-6.q16-2 libnss3-nssdb liboxideqt-qmlplugin liboxideqtcore0 liboxideqtquick0 libp11-kit-gnome-keyring libpango-perl libpeas-1.0-0-python3loader libperl5.22 libqt5feedback5 libqt5multimedia5 libqt5organizer5 libqt5positioning5 libqt5qml5 libqt5quick5 libqt5quicktest5 libqt5webkit5 libreoffice-gtk libsane libubuntugestures5 libubuntutoolkit5 libunity-webapps0 libwebkit2gtk-4.0-37-gtk2 onboard onboard-data perl-modules-5.22 pulseaudio-module-x11 pyotherside python3-aptdaemon.pkcompat qml-module-io-thp-pyotherside qml-module-qt-labs-folderlistmodel qml-module-qt-labs-settings qml-module-qtfeedback qml-module-qtgraphicaleffects qml-module-qtquick-layouts qml-module-qtquick-window2 qml-module-qtquick2 qml-module-qttest qml-module-ubuntu-components qml-module-ubuntu-layouts qml-module-ubuntu-onlineaccounts qml-module-ubuntu-performancemetrics qml-module-ubuntu-test qml-module-ubuntu-web qmlscene qtdeclarative5-accounts-plugin qtdeclarative5-dev-tools qtdeclarative5-qtquick2-plugin qtdeclarative5-test-plugin qtdeclarative5-ubuntu-ui-toolkit-plugin qtdeclarative5-unity-action-plugin rhythmbox-plugin-zeitgeist sessioninstaller signon-ui signon-ui-x11 system-config-printer-gnome ttf-ubuntu-font-family unity unity-asset-pool unity-control-center-faces unity-control-center-signon unity-scope-gdrive unity-webapps-common unity-webapps-qml unity-webapps-service webapp-container webbrowser-app xdiagnose xserver-xorg-input-evdev xserver-xorg-input-synaptics xserver-xorg-input-vmmouse