diff --git a/.github/workflows/appimage.yml b/.github/workflows/appimage.yml
index 86ba8e4b..470d9e10 100644
--- a/.github/workflows/appimage.yml
+++ b/.github/workflows/appimage.yml
@@ -182,6 +182,6 @@ jobs:
             shasum --binary --algorithm "${algo}" "${asset}" >"${asset}.sha${algo}"
           done
       - name: Upload artifacts to GitHub release
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
         with:
           files: assets/*
diff --git a/AppImageBuilder.debian-bullseye.yml b/AppImageBuilder.debian-bullseye.yml
index eda29976..0984849e 100644
--- a/AppImageBuilder.debian-bullseye.yml
+++ b/AppImageBuilder.debian-bullseye.yml
@@ -41,24 +41,42 @@ AppDir:
       fi
     done
 
-    # install python3-vdf manually if not available as package
-    if ! apt-cache search --names-only python3-vdf | grep -q .; then
-      pip install --target "${TARGET_APPDIR}/usr/lib/python3/dist-packages/" vdf
+    # remove unused icons
+    icons="${TARGET_APPDIR}/usr/share/icons"
+    keep=$(
+      # Subset of: `wget -q https://specifications.freedesktop.org/icon-naming-spec/latest -O- | sed -nE 's:.*</td></tr><tr><td>([^<]+).*:\1:p' | sort`
+      printf '%s\n' index.theme close- edit- go- list- pan- window-
+      grep -rhoP '"icon_name">\K[^<]+(?=<)' glade
+      grep -rhoP 'icon_name *= *"\K[^"]+(?=")' scc
+    )
+    map_item() { echo "${1}" | while read -r item; do printf -- "${2}" "${item}"; done; }
+    paths=$(find "${icons}" '(' -false $(map_item "${keep}" ' -o -name %s*') ')' -print -type l -printf '%h/%l\n' | sort | uniq)
+    find "${icons}" \( -type d -empty -or -not -type d $(map_item "${paths}" ' -not -samefile %s') \) -delete
+    cancel() { echo >&2 "ERROR: ${@}" && return 1; }
+    if find "${icons}" -xtype l | grep .; then
+      cancel 'The symlinks shown above are broken.'
+    fi
+    if echo "${keep}" | while read -r icon; do echo "${paths}" | grep -q "${icon}[^/]*$" || echo "${icon}"; done | grep .; then
+      cancel 'The icons above are missing.'
     fi
 
-  after_runtime: |
-    set -eu
+    # Enable icon theme
+    xdg_settings="${TARGET_APPDIR}/etc/xdg/gtk-3.0/settings.ini"
+    if [ ! -e "${xdg_settings}" ]; then
+      mkdir -p "$(dirname "${xdg_settings}")"
+      theme=$(find "${icons}" -mindepth 1 -maxdepth 1 -type d -printf %f -quit)
+      printf '[Settings]\ngtk-icon-theme-name = %s\n' "${theme}" >"${xdg_settings}"
+    fi
 
-    # python3 is linked against 'lib64/ld-linux-x86-64.so.2'
-    # but 'compat/lib64' is missing for Ubuntu Noble
-    compat="${TARGET_APPDIR}/runtime/compat"
-    if [ ! -e "${compat}/lib64" ] && [ -d "${compat}/usr/lib64" ]; then
-      ln -s "usr/lib64" "${compat}/"
+    # install python3-vdf manually if not available as package
+    if ! apt-cache search --names-only python3-vdf | grep -q .; then
+      pip install --target "${TARGET_APPDIR}/usr/lib/python3/dist-packages/" vdf
     fi
 
   apt:
     arch:
       - "{{APPIMAGE_APT_ARCH}}"
+
     sources:
       - sourceline: deb http://deb.debian.org/debian {{APPIMAGE_APT_DISTRO}} main
         key_url: http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x{{APPIMAGE_APT_PUBKEY}}
@@ -72,16 +90,13 @@ AppDir:
       - libbluetooth3
       - libgtk-3-0
       - librsvg2-common
-      - libx11-6
-      - libxcb1
-      - libxext6
-      - libxfixes3
       - python3-evdev
       - python3-gi-cairo
       - python3-pylibacl
       - python3-usb1
       - binutils         # required for detection of bluetooth library
       - coreutils        # provides /usr/bin/env
+      - paper-icon-theme # required for icons
       - shared-mime-info # required for gui if host provides no MIME info, e.g. when XDG_DATA_DIRS is missing
 
     exclude:
@@ -128,14 +143,7 @@ AppDir:
       - libtirpc*       # development
       - libuuid*        # development
       - media-types     # codec
-
-      # Debian Trixie
-      - libgprofng*     # development
-      - libjansson*     # codec
-      - libsframe*      # development
-      - libcloudproviders* # networking
-      - netbase         # network
-      - tzdata          # date/time
+      - tzdata
 
       # Debian Bullseye
       - glib-networking* # network
@@ -152,7 +160,7 @@ AppDir:
       - usr/bin/*gold*              # alternative for ld
       - usr/bin/*gp-display-html*   # requires perl
       - usr/lib/*/gconv             # unicode
-      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g].so # only png & svg are required
+      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g]*.so # only png & svg are required
       - usr/lib/*/glib-2.0
       - usr/lib/python*/cgi.py
       - usr/lib/python*/email
diff --git a/AppImageBuilder.debian.yml b/AppImageBuilder.debian.yml
index 4ce9287a..2f0cec9d 100644
--- a/AppImageBuilder.debian.yml
+++ b/AppImageBuilder.debian.yml
@@ -41,11 +41,37 @@ AppDir:
       fi
     done
 
+    # remove unused icons
+    icons="${TARGET_APPDIR}/usr/share/icons"
+    keep=$(
+      # Subset of: `wget -q https://specifications.freedesktop.org/icon-naming-spec/latest -O- | sed -nE 's:.*</td></tr><tr><td>([^<]+).*:\1:p' | sort`
+      printf '%s\n' index.theme close- edit- go- list- pan- window-
+      grep -rhoP '"icon_name">\K[^<]+(?=<)' glade
+      grep -rhoP 'icon_name *= *"\K[^"]+(?=")' scc
+    )
+    map_item() { echo "${1}" | while read -r item; do printf -- "${2}" "${item}"; done; }
+    paths=$(find "${icons}" '(' -false $(map_item "${keep}" ' -o -name %s*') ')' -print -type l -printf '%h/%l\n' | sort | uniq)
+    find "${icons}" \( -type d -empty -or -not -type d $(map_item "${paths}" ' -not -samefile %s') \) -delete
+    cancel() { echo >&2 "ERROR: ${@}" && return 1; }
+    if find "${icons}" -xtype l | grep .; then
+      cancel 'The symlinks shown above are broken.'
+    fi
+    if echo "${keep}" | while read -r icon; do echo "${paths}" | grep -q "${icon}[^/]*$" || echo "${icon}"; done | grep .; then
+      cancel 'The icons above are missing.'
+    fi
+
+    # Enable icon theme
+    xdg_settings="${TARGET_APPDIR}/etc/xdg/gtk-3.0/settings.ini"
+    if [ ! -e "${xdg_settings}" ]; then
+      mkdir -p "$(dirname "${xdg_settings}")"
+      theme=$(find "${icons}" -mindepth 1 -maxdepth 1 -type d -printf %f -quit)
+      printf '[Settings]\ngtk-icon-theme-name = %s\n' "${theme}" >"${xdg_settings}"
+    fi
+
   after_runtime: |
     set -eu
 
-    # python3 is linked against 'lib64/ld-linux-x86-64.so.2'
-    # but 'compat/lib64' is missing for Ubuntu Noble
+    # python3 is linked against 'lib64/ld-linux-x86-64.so.2' but 'compat/lib64' is missing
     compat="${TARGET_APPDIR}/runtime/compat"
     if [ ! -e "${compat}/lib64" ] && [ -d "${compat}/usr/lib64" ]; then
       ln -s "usr/lib64" "${compat}/"
@@ -54,6 +80,7 @@ AppDir:
   apt:
     arch:
       - "{{APPIMAGE_APT_ARCH}}"
+
     sources:
       - sourceline: deb http://deb.debian.org/debian {{APPIMAGE_APT_DISTRO}} main
         key_url: http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x{{APPIMAGE_APT_PUBKEY}}
@@ -67,17 +94,14 @@ AppDir:
       - libbluetooth3
       - libgtk-3-0
       - librsvg2-common
-      - libx11-6
-      - libxcb1
-      - libxext6
-      - libxfixes3
       - python3-evdev
       - python3-gi-cairo
       - python3-pylibacl
-      - python3-vdf
       - python3-usb1
+      - python3-vdf
       - binutils         # required for detection of bluetooth library
       - coreutils        # provides /usr/bin/env
+      - paper-icon-theme # required for icons
       - shared-mime-info # required for gui if host provides no MIME info, e.g. when XDG_DATA_DIRS is missing
 
     exclude:
@@ -138,7 +162,7 @@ AppDir:
       - usr/bin/*gold*              # alternative for ld
       - usr/bin/*gp-display-html*   # requires perl
       - usr/lib/*/gconv             # unicode
-      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g].so # only png & svg are required
+      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g]*.so # only png & svg are required
       - usr/lib/*/glib-2.0
       - usr/lib/python*/cgi.py
       - usr/lib/python*/email
diff --git a/AppImageBuilder.test.Dockerfile b/AppImageBuilder.test.Dockerfile
index b4dbb424..20e4489f 100644
--- a/AppImageBuilder.test.Dockerfile
+++ b/AppImageBuilder.test.Dockerfile
@@ -27,11 +27,22 @@ RUN <<EOR
     fi
   }
 
+  prepare() {
+    if command -v apt-get >/dev/null; then
+      apt-get update && apt-get install -y --no-install-recommends libx11-6
+    elif command -v pacman >/dev/null; then
+      pacman -Syu --noconfirm libx11
+    elif command -v dnf >/dev/null; then
+      dnf list updates && dnf install -y libX11
+    fi
+  }
+
   main() {
     files="$(find /opt/ -maxdepth 1 -type f -name '*.AppImage')"
     if [ -z "${files}" ]; then
       cancel "Error: No AppImage file found."
     fi
+    prepare
     echo "${files}" | while read -r file; do
       log "${file}"
       chmod +x "${file}"
diff --git a/AppImageBuilder.ubuntu-focal.yml b/AppImageBuilder.ubuntu-focal.yml
index f97e57a6..ce77ea1a 100644
--- a/AppImageBuilder.ubuntu-focal.yml
+++ b/AppImageBuilder.ubuntu-focal.yml
@@ -46,19 +46,37 @@ AppDir:
       pip install --target "${TARGET_APPDIR}/usr/lib/python3/dist-packages/" vdf
     fi
 
-  after_runtime: |
-    set -eu
+    # remove unused icons
+    icons="${TARGET_APPDIR}/usr/share/icons"
+    keep=$(
+      # Subset of: `wget -q https://specifications.freedesktop.org/icon-naming-spec/latest -O- | sed -nE 's:.*</td></tr><tr><td>([^<]+).*:\1:p' | sort`
+      printf '%s\n' index.theme close- edit- go- list- pan- window-
+      grep -rhoP '"icon_name">\K[^<]+(?=<)' glade
+      grep -rhoP 'icon_name *= *"\K[^"]+(?=")' scc
+    )
+    map_item() { echo "${1}" | while read -r item; do printf -- "${2}" "${item}"; done; }
+    paths=$(find "${icons}" '(' -false $(map_item "${keep}" ' -o -name %s*') ')' -print -type l -printf '%h/%l\n' | sort | uniq)
+    find "${icons}" \( -type d -empty -or -not -type d $(map_item "${paths}" ' -not -samefile %s') \) -delete
+    cancel() { echo >&2 "ERROR: ${@}" && return 1; }
+    if find "${icons}" -xtype l | grep .; then
+      cancel 'The symlinks shown above are broken.'
+    fi
+    if echo "${keep}" | while read -r icon; do echo "${paths}" | grep -q "${icon}[^/]*$" || echo "${icon}"; done | grep .; then
+      cancel 'The icons above are missing.'
+    fi
 
-    # python3 is linked against 'lib64/ld-linux-x86-64.so.2'
-    # but 'compat/lib64' is missing for Ubuntu Noble
-    compat="${TARGET_APPDIR}/runtime/compat"
-    if [ ! -e "${compat}/lib64" ] && [ -d "${compat}/usr/lib64" ]; then
-      ln -s "usr/lib64" "${compat}/"
+    # Enable icon theme
+    xdg_settings="${TARGET_APPDIR}/etc/xdg/gtk-3.0/settings.ini"
+    if [ ! -e "${xdg_settings}" ]; then
+      mkdir -p "$(dirname "${xdg_settings}")"
+      theme=$(find "${icons}" -mindepth 1 -maxdepth 1 -type d -printf %f -quit)
+      printf '[Settings]\ngtk-icon-theme-name = %s\n' "${theme}" >"${xdg_settings}"
     fi
 
   apt:
     arch:
       - "{{APPIMAGE_APT_ARCH}}"
+
     sources:
       - sourceline: deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ {{APPIMAGE_APT_DISTRO}} main universe
         key_url: http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x{{APPIMAGE_APT_PUBKEY}}
@@ -67,6 +85,8 @@ AppDir:
       - sourceline: deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ {{APPIMAGE_APT_DISTRO}} main universe
       - sourceline: deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ {{APPIMAGE_APT_DISTRO}}-updates main universe
       - sourceline: deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ {{APPIMAGE_APT_DISTRO}}-security main universe
+      - sourceline: deb https://ppa.launchpadcontent.net/snwh/ppa/ubuntu focal main
+        key_url: http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x023634F5E3DE42B7594EB77B9528DA3D98902E4B
 
     include:
       - gir1.2-gtk-3.0
@@ -74,16 +94,13 @@ AppDir:
       - libbluetooth3
       - libgtk-3-0
       - librsvg2-common
-      - libx11-6
-      - libxcb1
-      - libxext6
-      - libxfixes3
       - python3-evdev
       - python3-gi-cairo
-      - python3-pylibacl
       - python3-libusb1
+      - python3-pylibacl
       - binutils         # required for detection of bluetooth library
       - coreutils        # provides /usr/bin/env
+      - paper-icon-theme # required for icons
       - shared-mime-info # required for gui if host provides no MIME info, e.g. when XDG_DATA_DIRS is missing
 
     exclude:
@@ -140,19 +157,12 @@ AppDir:
       - libunistring*    # unicode
       - mime-support     # codec
 
-      # Ubuntu Noble
-      - libgprofng*     # development
-      - libjansson*     # codec
-      - libsframe*      # development
-      - netbase         # network
-      - tzdata          # date/time
-
   files:
     exclude:
       - usr/bin/*gold*              # alternative for ld
       - usr/bin/*gp-display-html*   # requires perl
       - usr/lib/*/gconv             # unicode
-      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g].so # only png & svg are required
+      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g]*.so # only png & svg are required
       - usr/lib/*/glib-2.0
       - usr/lib/python*/cgi.py
       - usr/lib/python*/email
diff --git a/AppImageBuilder.yml b/AppImageBuilder.yml
index 52ffc3ee..07e1f8d1 100644
--- a/AppImageBuilder.yml
+++ b/AppImageBuilder.yml
@@ -41,11 +41,37 @@ AppDir:
       fi
     done
 
+    # remove unused icons
+    icons="${TARGET_APPDIR}/usr/share/icons"
+    keep=$(
+      # Subset of: `wget -q https://specifications.freedesktop.org/icon-naming-spec/latest -O- | sed -nE 's:.*</td></tr><tr><td>([^<]+).*:\1:p' | sort`
+      printf '%s\n' index.theme close- edit- go- list- pan- window-
+      grep -rhoP '"icon_name">\K[^<]+(?=<)' glade
+      grep -rhoP 'icon_name *= *"\K[^"]+(?=")' scc
+    )
+    map_item() { echo "${1}" | while read -r item; do printf -- "${2}" "${item}"; done; }
+    paths=$(find "${icons}" '(' -false $(map_item "${keep}" ' -o -name %s*') ')' -print -type l -printf '%h/%l\n' | sort | uniq)
+    find "${icons}" \( -type d -empty -or -not -type d $(map_item "${paths}" ' -not -samefile %s') \) -delete
+    cancel() { echo >&2 "ERROR: ${@}" && return 1; }
+    if find "${icons}" -xtype l | grep .; then
+      cancel 'The symlinks shown above are broken.'
+    fi
+    if echo "${keep}" | while read -r icon; do echo "${paths}" | grep -q "${icon}[^/]*$" || echo "${icon}"; done | grep .; then
+      cancel 'The icons above are missing.'
+    fi
+
+    # Enable icon theme
+    xdg_settings="${TARGET_APPDIR}/etc/xdg/gtk-3.0/settings.ini"
+    if [ ! -e "${xdg_settings}" ]; then
+      mkdir -p "$(dirname "${xdg_settings}")"
+      theme=$(find "${icons}" -mindepth 1 -maxdepth 1 -type d -printf %f -quit)
+      printf '[Settings]\ngtk-icon-theme-name = %s\n' "${theme}" >"${xdg_settings}"
+    fi
+
   after_runtime: |
     set -eu
 
-    # python3 is linked against 'lib64/ld-linux-x86-64.so.2'
-    # but 'compat/lib64' is missing for Ubuntu Noble
+    # python3 is linked against 'lib64/ld-linux-x86-64.so.2' but 'compat/lib64' is missing
     compat="${TARGET_APPDIR}/runtime/compat"
     if [ ! -e "${compat}/lib64" ] && [ -d "${compat}/usr/lib64" ]; then
       ln -s "usr/lib64" "${compat}/"
@@ -54,6 +80,7 @@ AppDir:
   apt:
     arch:
       - "{{APPIMAGE_APT_ARCH}}"
+
     sources:
       - sourceline: deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ {{APPIMAGE_APT_DISTRO}} main universe
         key_url: http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x{{APPIMAGE_APT_PUBKEY}}
@@ -69,17 +96,14 @@ AppDir:
       - libbluetooth3
       - libgtk-3-0
       - librsvg2-common
-      - libx11-6
-      - libxcb1
-      - libxext6
-      - libxfixes3
       - python3-evdev
       - python3-gi-cairo
       - python3-pylibacl
+      - python3-usb1
       - python3-vdf
-      - python3-libusb1
       - binutils         # required for detection of bluetooth library
       - coreutils        # provides /usr/bin/env
+      - paper-icon-theme # required for icons
       - shared-mime-info # required for gui if host provides no MIME info, e.g. when XDG_DATA_DIRS is missing
 
     exclude:
@@ -139,7 +163,7 @@ AppDir:
       - usr/bin/*gold*              # alternative for ld
       - usr/bin/*gp-display-html*   # requires perl
       - usr/lib/*/gconv             # unicode
-      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g].so # only png & svg are required
+      - usr/lib/*/gdk-pixbuf-2.0/*/loaders/libpixbufloader-??[!g]*.so # only png & svg are required
       - usr/lib/*/glib-2.0
       - usr/lib/python*/cgi.py
       - usr/lib/python*/email