Instalando o desktop XFCE (pacote: xubuntu-desktop) ao lado da área de trabalho do GNOME (pacote: ubuntu-desktop): quebras de ubuntu-desktop

Question

O problema

Gostaria de instalar a interface XFCE ao lado da interface do GNOME que vem pré-instalada no Ubuntu.

No entanto, quando tento instalar o pacote xubuntu-desktop , acabo com isso:

[kahless]# aptitude install xubuntu-desktop
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initializing package states... Done
Writing extended state information... Done
The following packages are BROKEN:
  ubuntu-desktop 
The following NEW packages will be installed:
  a2ps{a} abiword abiword-common{a} abiword-plugin-grammar{a} 
  abiword-plugin-mathview{a} app-install-data-commercial aumix{a} 
  aumix-common{a} catfish exaile exo-utils{a} fortune-mod{a} 
  fortunes-min{a} gigolo gnumeric gnumeric-common{a} gnumeric-doc{a} 
  gtk2-engines-xfce libabiword-2.8{a} libaiksaurus-1.2-0c2a{a} 
  libaiksaurus-1.2-data{a} libaiksaurusgtk-1.2-0c2a{a} libexo-0.3-0{a} 
  libexo-common{a} libgdome2-0{a} libgdome2-cpp-smart0c2a{a} 
  libgtkmathview0c2a{a} liblink-grammar4{a} libotr2{a} libots0{a} 
  libpsiconv6{a} librecode0{a} libscim8c2a{a} libsdl1.2debian-alsa 
  libtagc0{a} libthunar-vfs-1-2{a} libwv-1.2-3{a} libxfce4menu-0.1-0{a} 
  libxfce4util-bin{a} libxfce4util-common{a} libxfce4util4{a} 
  libxfcegui4-4{a} libxfconf-0-2{a} libxmlrpc-core-c3{a} 
  link-grammar-dictionaries-en{a} mousepad murrine-themes{a} orage 
  oss-compat{a} pidgin pidgin-data{a} pidgin-libnotify{a} pidgin-otr 
  psutils{a} python-cddb{a} python-mmkeys{a} python-mutagen{a} 
  python-sexy{a} ristretto scim scim-bridge-agent{a} 
  scim-bridge-client-gtk{a} scim-gtk2-immodule{a} scim-modules-socket{a} 
  scim-modules-table{a} scim-tables-additional tango-icon-theme-common 
  thunar thunar-archive-plugin thunar-data{a} thunar-media-tags-plugin 
  thunar-thumbnailers thunar-volman{a} thunderbird ttf-lyx{a} usb-creator 
  xfce-keyboard-shortcuts{a} xfce4-appfinder xfce4-clipman{a} 
  xfce4-clipman-plugin xfce4-cpugraph-plugin xfce4-dict 
  xfce4-fsguard-plugin xfce4-mailwatch-plugin xfce4-mixer 
  xfce4-mount-plugin xfce4-netload-plugin xfce4-notes{a} xfce4-notes-plugin 
  xfce4-panel{a} xfce4-places-plugin xfce4-power-manager 
  xfce4-power-manager-data{a} xfce4-quicklauncher-plugin 
  xfce4-screenshooter xfce4-session xfce4-settings{a} 
  xfce4-smartbookmark-plugin xfce4-systemload-plugin xfce4-terminal 
  xfce4-utils{a} xfce4-verve-plugin xfce4-volumed xfce4-weather-plugin 
  xfce4-xkb-plugin xfconf{a} xfdesktop4{a} xfdesktop4-data{a} xfprint4 
  xfswitch-plugin xfwm4{a} xfwm4-themes{a} xscreensaver xubuntu-artwork{a} 
  xubuntu-default-settings xubuntu-desktop xubuntu-docs 
  xubuntu-gdm-theme{a} xubuntu-icon-theme{a} xubuntu-plymouth-theme{a} 
  xubuntu-wallpapers{a} 
The following packages will be REMOVED:
  libsdl1.2debian-pulseaudio{a} xaw3dg{u} 
0 packages upgraded, 121 newly installed, 2 to remove and 1 not upgraded.
Need to get 75.7MB of archives. After unpacking 261MB will be used.
The following packages have unmet dependencies:
  ubuntu-desktop: Depends: libsdl1.2debian-pulseaudio but it is not installable
The following actions will resolve these dependencies:

Remove the following packages:
ubuntu-desktop

Leave the following dependencies unresolved:
catfish recommends slocate
Score is -81

Accept this solution? [Y/n/q/?]

Estas linhas aqui me preocupam mais:

Remove the following packages:
ubuntu-desktop

Existe uma maneira de instalar o desktop XFCE ao lado do Gnome sem causar quebra de desktop Ubuntu?

Mais informações (1)

Usar apt-get resulta no mesmo problema.

Mais informações (2)

Anexadas são as outras soluções que o aptitude fornece:

A solução 1 foi listada acima.

Solução 2:     As ações a seguir resolverão essas dependências:

Keep the following packages at their current version:
libsdl1.2debian-alsa [Not Installed]
libsdl1.2debian-pulseaudio [1.2.14-4ubuntu1.1 (lucid-updates, now)]

Leave the following dependencies unresolved:
catfish recommends slocate
xubuntu-desktop recommends libsdl1.2debian-alsa
Score is -210

Accept this solution? [Y/n/q/?] 

Solução 3:

The following actions will resolve these dependencies:

Keep the following packages at their current version:
libsdl1.2debian-alsa [Not Installed]

Downgrade the following packages:
libsdl1.2debian [1.2.14-4ubuntu1.1 (lucid-updates, now) -> 1.2.14-4ubuntu1 (lucid)]
libsdl1.2debian-pulseaudio [1.2.14-4ubuntu1.1 (lucid-updates, now) -> 1.2.14-4ubuntu1 (lucid)]

Leave the following dependencies unresolved:
catfish recommends slocate
xubuntu-desktop recommends libsdl1.2debian-alsa
Score is -220

Accept this solution? [Y/n/q/?] 

    

Answer 1

Eu acho que o aptitude está tentando remover o ubuntu-desktop porque está quebrado:

"The following packages are BROKEN:
ubuntu-desktop"   

1) Você pode ir para Sistema > Administração do Gerenciador de Pacotes Synaptic e, em seguida, vá para Editar > Corrigir pacotes quebrados .

2) Se "1" falhar, escolha "n" para não aceitar a opção de remover o ubuntu-desktop.

3) Para restaurar o gerenciador de login do Gnome:

gksu gedit /etc/X11/default-display-manager  

e altere seu conteúdo para /usr/sbin/gdm

ps .: se você não gosta do tema gdm xubuntu, pode removê-lo:

sudo aptitude remove xubuntu-gdm-theme  

Atenciosamente.