setup: add KDE Plasma, GNOME, COSMIC, XFCE, LXQt DE modules

Each script installs the DE meta-package, an appropriate display manager,
PipeWire audio, NetworkManager, Bluetooth, and Flatpak, then enables the
relevant services (sddm/gdm/lightdm/cosmic-greeter).

COSMIC falls back to sddm if cosmic-greeter is not installed.

tui-install.sh: DE menu expanded from 3 to 8 entries (height 20×70).
install-modules.sh: DEs added to checklist, summary, and dispatch so
they can be installed standalone on an existing system.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

setup/install-modules.sh

@@ -84,6 +84,11 @@ run_module() {
 count_steps() {
     local sel="$1"
     TOTAL=0
+    [[ "$sel" == *"kde-plasma"*      ]] && TOTAL=$(( TOTAL + 1 ))
+    [[ "$sel" == *"gnome"*           ]] && TOTAL=$(( TOTAL + 1 ))
+    [[ "$sel" == *"cosmic"*          ]] && TOTAL=$(( TOTAL + 1 ))
+    [[ "$sel" == *"xfce"*            ]] && TOTAL=$(( TOTAL + 1 ))
+    [[ "$sel" == *"lxqt"*            ]] && TOTAL=$(( TOTAL + 1 ))
     [[ "$sel" == *"ollama"*          ]] && TOTAL=$(( TOTAL + 1 ))
     [[ "$sel" == *"llama-cpp"*       ]] && TOTAL=$(( TOTAL + 1 ))
     [[ "$sel" == *"open-webui"*      ]] && TOTAL=$(( TOTAL + 1 ))
@@ -150,6 +155,12 @@ SELECTED=$(dialog --backtitle "$BACKTITLE" \
     --title " Select Modules " \
     --checklist "Space toggles  ·  Enter confirms  ·  Arrow keys scroll" 40 76 32 \
     \
+    "kde-plasma"      "KDE Plasma        full Plasma DE + sddm"                  off \
+    "gnome"           "GNOME             GNOME Shell + gdm"                      off \
+    "cosmic"          "COSMIC            Rust-based Wayland DE (System76)"       off \
+    "xfce"            "XFCE              lightweight X11 DE + lightdm"           off \
+    "lxqt"            "LXQt              lightweight Qt X11 DE + sddm"           off \
+    \
     "ollama"          "Ollama            local LLM runner + API server"          off \
     "llama-cpp"       "llama.cpp         standalone inference CLI + server"      off \
     "open-webui"      "Open WebUI        browser UI for Ollama / LLM backends"  off \
@@ -197,6 +208,11 @@ SELECTED=$(dialog --backtitle "$BACKTITLE" \
 [[ -z "$SELECTED" ]] && { clear; echo "Nothing selected."; exit 0; }
 
 SUMMARY=""
+[[ "$SELECTED" == *"kde-plasma"*     ]] && SUMMARY+="  ✦ KDE Plasma\n"
+[[ "$SELECTED" == *"gnome"*          ]] && SUMMARY+="  ✦ GNOME\n"
+[[ "$SELECTED" == *"cosmic"*         ]] && SUMMARY+="  ✦ COSMIC\n"
+[[ "$SELECTED" == *"xfce"*           ]] && SUMMARY+="  ✦ XFCE\n"
+[[ "$SELECTED" == *"lxqt"*           ]] && SUMMARY+="  ✦ LXQt\n"
 [[ "$SELECTED" == *"ollama"*         ]] && SUMMARY+="  ✦ Ollama\n"
 [[ "$SELECTED" == *"llama-cpp"*      ]] && SUMMARY+="  ✦ llama.cpp\n"
 [[ "$SELECTED" == *"open-webui"*     ]] && SUMMARY+="  ✦ Open WebUI\n"
@@ -246,6 +262,12 @@ dialog --backtitle "$BACKTITLE" \
 
 count_steps "$SELECTED"
 
+DE_DIR="$MODULES/Desktop-Environments"
+[[ "$SELECTED" == *"kde-plasma"*     ]] && run_module "KDE Plasma"         "$DE_DIR/kde-plasma.sh"
+[[ "$SELECTED" == *"gnome"*          ]] && run_module "GNOME"              "$DE_DIR/gnome.sh"
+[[ "$SELECTED" == *"cosmic"*         ]] && run_module "COSMIC"             "$DE_DIR/cosmic.sh"
+[[ "$SELECTED" == *"xfce"*           ]] && run_module "XFCE"              "$DE_DIR/xfce.sh"
+[[ "$SELECTED" == *"lxqt"*           ]] && run_module "LXQt"              "$DE_DIR/lxqt.sh"
 [[ "$SELECTED" == *"ollama"*         ]] && run_module "Ollama"            "$APPS/ollama.sh"
 [[ "$SELECTED" == *"llama-cpp"*      ]] && run_module "llama.cpp"         "$APPS/llama-cpp.sh"
 [[ "$SELECTED" == *"open-webui"*     ]] && run_module "Open WebUI"        "$APPS/open-webui.sh"

setup/modules/Desktop-Environments/cosmic.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "=== COSMIC Desktop Installer ==="
+
+echo "[+] Installing COSMIC..."
+sudo pacman -S --noconfirm --needed \
+    cosmic \
+    pipewire wireplumber pipewire-alsa pipewire-jack pipewire-pulse \
+    networkmanager \
+    bluez bluez-utils \
+    flatpak
+
+echo "[+] Enabling services..."
+# cosmic-greeter is COSMIC's own display manager; fall back to sddm if absent
+if pacman -Qi cosmic-greeter &>/dev/null; then
+    sudo systemctl enable cosmic-greeter.service
+else
+    sudo pacman -S --noconfirm --needed sddm
+    sudo systemctl enable sddm.service
+fi
+sudo systemctl enable NetworkManager.service
+sudo systemctl enable bluetooth.service
+
+echo "=== COSMIC installation complete. Reboot to start. ==="

setup/modules/Desktop-Environments/gnome.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "=== GNOME Installer ==="
+
+echo "[+] Installing GNOME..."
+sudo pacman -S --noconfirm --needed \
+    gnome \
+    gnome-tweaks \
+    xdg-desktop-portal-gnome \
+    pipewire wireplumber pipewire-alsa pipewire-jack pipewire-pulse \
+    networkmanager \
+    flatpak
+
+echo "[+] Enabling services..."
+sudo systemctl enable gdm.service
+sudo systemctl enable NetworkManager.service
+
+echo "=== GNOME installation complete. Reboot to start. ==="

setup/modules/Desktop-Environments/kde-plasma.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "=== KDE Plasma Installer ==="
+
+echo "[+] Installing KDE Plasma..."
+sudo pacman -S --noconfirm --needed \
+    plasma-meta \
+    sddm sddm-kcm \
+    xdg-desktop-portal-kde \
+    konsole dolphin kate gwenview ark spectacle okular elisa \
+    plasma-browser-integration \
+    pipewire wireplumber pipewire-alsa pipewire-jack pipewire-pulse \
+    networkmanager \
+    bluez bluez-utils bluedevil \
+    power-profiles-daemon \
+    flatpak
+
+echo "[+] Enabling services..."
+sudo systemctl enable sddm.service
+sudo systemctl enable NetworkManager.service
+sudo systemctl enable bluetooth.service
+
+echo "=== KDE Plasma installation complete. Reboot to start. ==="

setup/modules/Desktop-Environments/lxqt.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "=== LXQt Installer ==="
+
+echo "[+] Installing LXQt..."
+sudo pacman -S --noconfirm --needed \
+    lxqt \
+    openbox obconf-qt \
+    sddm \
+    breeze-icons \
+    xdg-desktop-portal-gtk \
+    xorg-server xorg-xinit \
+    pipewire wireplumber pipewire-alsa pipewire-jack pipewire-pulse \
+    networkmanager network-manager-applet \
+    bluez bluez-utils blueman \
+    gvfs gvfs-smb gvfs-mtp \
+    flatpak
+
+echo "[+] Enabling services..."
+sudo systemctl enable sddm.service
+sudo systemctl enable NetworkManager.service
+sudo systemctl enable bluetooth.service
+
+echo "=== LXQt installation complete. Reboot to start. ==="

setup/modules/Desktop-Environments/xfce.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "=== XFCE Installer ==="
+
+echo "[+] Installing XFCE..."
+sudo pacman -S --noconfirm --needed \
+    xfce4 xfce4-goodies \
+    lightdm lightdm-gtk-greeter lightdm-gtk-greeter-settings \
+    xdg-desktop-portal-gtk \
+    pipewire wireplumber pipewire-alsa pipewire-jack pipewire-pulse \
+    xfce4-pulseaudio-plugin \
+    networkmanager network-manager-applet \
+    bluez bluez-utils blueman \
+    gvfs gvfs-smb gvfs-mtp \
+    flatpak
+
+echo "[+] Enabling services..."
+sudo systemctl enable lightdm.service
+sudo systemctl enable NetworkManager.service
+sudo systemctl enable bluetooth.service
+
+echo "=== XFCE installation complete. Reboot to start. ==="

setup/tui-install.sh

@@ -175,9 +175,14 @@ DE="none"
 if [[ "$COMPONENTS" == *"de"* ]]; then
     DE=$(dialog --backtitle "$BACKTITLE" \
         --title " Desktop Environment " \
-        --menu "Select a desktop environment:" 11 56 3 \
+        --menu "Select a desktop environment:" 20 70 8 \
         "hyprland"   "Hyprland   — Wayland WM, full setup (primary)" \
         "sway"       "Sway       — Wayland tiling WM" \
+        "kde-plasma" "KDE Plasma — feature-rich Wayland/X11 DE" \
+        "gnome"      "GNOME      — modern Wayland DE" \
+        "cosmic"     "COSMIC     — Rust-built Wayland DE (System76)" \
+        "xfce"       "XFCE       — lightweight X11 DE" \
+        "lxqt"       "LXQt       — lightweight Qt X11 DE" \
         "none"       "Skip DE installation" \
         3>&1 1>&2 2>&3) || DE="none"
 fi
@@ -299,6 +304,11 @@ if [[ "$COMPONENTS" == *"de"* && "$DE" != "none" ]]; then
     case "$DE" in
         hyprland)   run_module "Hyprland"    "$MODULES/Desktop-Environments/hyprland.sh" ;;
         sway)       run_module "Sway"        "$MODULES/Desktop-Environments/sway.sh" ;;
+        kde-plasma) run_module "KDE Plasma"  "$MODULES/Desktop-Environments/kde-plasma.sh" ;;
+        gnome)      run_module "GNOME"       "$MODULES/Desktop-Environments/gnome.sh" ;;
+        cosmic)     run_module "COSMIC"      "$MODULES/Desktop-Environments/cosmic.sh" ;;
+        xfce)       run_module "XFCE"        "$MODULES/Desktop-Environments/xfce.sh" ;;
+        lxqt)       run_module "LXQt"        "$MODULES/Desktop-Environments/lxqt.sh" ;;
     esac
 fi