Eu resolvi isso. Não encontrei nada enquanto procurava uma solução, mas encontrei mais informações sobre o problema:
Estes são os pacotes que são desinstalados quando você tenta remover o servidor da lâmpada da maneira que fiz:
apache2 apache2-mpm-prefork apache2-utils apache2.2-bin apache2.2-common bluez-cups cups cups-driver-gutenprint cups-pdf foo2zjs gdm gdm-guest-session gecko-mediaplayer gnome-applets gnome-control-center gnome-media gnome-mplayer gnome-panel gnome-session gnome-settings-daemon goldendict gstreamer0.10-pulseaudio hpijs hplip hplip-cups indicator-applet indicator-applet-appmenu indicator-applet-complete indicator-sound libapache2-mod-php5 libapr1 libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap libasound2-plugins libcanberra-pulse libdbd-mysql-perl libdbi-perl libhpmud0 libhtml-template-perl libmysqlclient16 libnet-daemon-perl libphonon4 libplrpc-perl libpulse-browse0 libpulse-mainloop-glib0 libpulse0 libqtwebkit4 libsane-hpaio libsdl1.2debian-pulseaudio libsnmp15 libwrap0 mplayer mysql-client-5.1 mysql-client-core-5.1 mysql-common mysql-server mysql-server-5.1 mysql-server-core-5.1 phonon phonon-backend-gstreamer php5-cli php5-common php5-mysql pulseaudio pulseaudio-esound-compat pulseaudio-module-bluetooth pulseaudio-module-gconf pulseaudio-module-x11 pulseaudio-module-zeroconf pulseaudio-utils pxljr python-speechd speech-dispatcher splix ssl-cert tcpd vlc-plugin-pulse
Então, isso é o que resolveu meu problema:
sudo apt-get install apache2 apache2-mpm-prefork apache2-utils apache2.2-bin apache2.2-common bluez-cups cups cups-driver-gutenprint cups-pdf foo2zjs gdm gdm-guest-session gecko-mediaplayer gnome-applets gnome-control-center gnome-media gnome-mplayer gnome-panel gnome-session gnome-settings-daemon goldendict gstreamer0.10-pulseaudio hpijs hplip hplip-cups indicator-applet indicator-applet-appmenu indicator-applet-complete indicator-sound libapache2-mod-php5 libapr1 libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap libasound2-plugins libcanberra-pulse libdbd-mysql-perl libdbi-perl libhpmud0 libhtml-template-perl libmysqlclient16 libnet-daemon-perl libphonon4 libplrpc-perl libpulse-browse0 libpulse-mainloop-glib0 libpulse0 libqtwebkit4 libsane-hpaio libsdl1.2debian-pulseaudio libsnmp15 libwrap0 mplayer mysql-client-5.1 mysql-client-core-5.1 mysql-common mysql-server mysql-server-5.1 mysql-server-core-5.1 phonon phonon-backend-gstreamer php5-cli php5-common php5-mysql pulseaudio pulseaudio-esound-compat pulseaudio-module-bluetooth pulseaudio-module-gconf pulseaudio-module-x11 pulseaudio-module-zeroconf pulseaudio-utils pxljr python-speechd speech-dispatcher splix ssl-cert tcpd vlc-plugin-pulse