diff --git a/Library/Homebrew/cask/artifact/moved.rb b/Library/Homebrew/cask/artifact/moved.rb
index d3c5331639b95f..b80e0a6ef7538c 100644
--- a/Library/Homebrew/cask/artifact/moved.rb
+++ b/Library/Homebrew/cask/artifact/moved.rb
@@ -180,7 +180,7 @@ def move_back(skip: false, force: false, adopt: false, command: nil, **options)
 
       def delete(target, force: false, successor: nil, command: nil, **_)
         ohai "Removing #{self.class.english_name} '#{target}'"
-        raise CaskError, "Cannot remove undeletable #{self.class.english_name}." if MacOS.undeletable?(target)
+        raise CaskError, "Cannot remove undeletable #{self.class.english_name}." if undeletable?(target)
 
         return unless Utils.path_occupied?(target)
 
@@ -196,6 +196,10 @@ def delete(target, force: false, successor: nil, command: nil, **_)
           Utils.gain_permissions_remove(target, command:)
         end
       end
+
+      def undeletable?(target); end
     end
   end
 end
+
+require "extend/os/cask/artifact/moved"
diff --git a/Library/Homebrew/cask/config.rb b/Library/Homebrew/cask/config.rb
index ae8c2539fb0aa3..8a53c7561003a6 100644
--- a/Library/Homebrew/cask/config.rb
+++ b/Library/Homebrew/cask/config.rb
@@ -30,14 +30,12 @@ class Config
         vst3_plugindir:       "~/Library/Audio/Plug-Ins/VST3",
         screen_saverdir:      "~/Library/Screen Savers",
       }.freeze,
-      T::Hash[Symbol, String],
+      T::Hash[Symbol, T.nilable(String)],
     )
 
     sig { returns(T::Hash[Symbol, T.untyped]) }
     def self.defaults
-      {
-        languages: LazyObject.new { MacOS.languages },
-      }.merge(DEFAULT_DIRS).freeze
+      DEFAULT_DIRS.freeze
     end
 
     sig { params(args: Homebrew::CLI::Args).returns(T.attached_class) }
@@ -223,3 +221,5 @@ def to_json(*options)
     end
   end
 end
+
+require "extend/os/cask/config"
diff --git a/Library/Homebrew/cask/installer.rb b/Library/Homebrew/cask/installer.rb
index a0cdf8b74a6443..b28851bb72d161 100644
--- a/Library/Homebrew/cask/installer.rb
+++ b/Library/Homebrew/cask/installer.rb
@@ -76,6 +76,7 @@ def fetch(quiet: nil, timeout: nil)
       satisfy_cask_and_formula_dependencies
     end
 
+    sig { void }
     def stage
       odebug "Cask::Installer#stage"
 
@@ -88,6 +89,7 @@ def stage
       raise e
     end
 
+    sig { void }
     def install
       start_time = Time.now
       odebug "Cask::Installer#install"
@@ -134,6 +136,7 @@ def install
       raise
     end
 
+    sig { void }
     def check_deprecate_disable
       deprecate_disable_type = DeprecateDisable.type(@cask)
       return if deprecate_disable_type.nil?
@@ -150,6 +153,7 @@ def check_deprecate_disable
       end
     end
 
+    sig { void }
     def check_conflicts
       return unless @cask.conflicts_with
 
@@ -166,6 +170,7 @@ def check_conflicts
       end
     end
 
+    sig { void }
     def uninstall_existing_cask
       return unless @cask.installed?
 
@@ -194,6 +199,7 @@ def download(quiet: nil, timeout: nil)
                                           timeout:)
     end
 
+    sig { void }
     def verify_has_sha
       odebug "Checking cask has checksum"
       return if @cask.sha256 != :no_check
@@ -211,6 +217,12 @@ def primary_container
       end
     end
 
+    sig { returns(ArtifactSet) }
+    def artifacts
+      @cask.artifacts
+    end
+
+    sig { params(to: Pathname).void }
     def extract_primary_container(to: @cask.staged_path)
       odebug "Extracting primary container"
 
@@ -240,7 +252,6 @@ def extract_primary_container(to: @cask.staged_path)
 
     sig { params(predecessor: T.nilable(Cask)).void }
     def install_artifacts(predecessor: nil)
-      artifacts = @cask.artifacts
       already_installed_artifacts = []
 
       odebug "Installing artifacts"
@@ -299,6 +310,7 @@ def check_macos_requirements
       raise CaskError, @cask.depends_on.macos.message(type: :cask)
     end
 
+    sig { void }
     def check_arch_requirements
       return if @cask.depends_on.arch.nil?
 
@@ -314,6 +326,7 @@ def check_arch_requirements
             "but you are running #{@current_arch}."
     end
 
+    sig { returns(T::Array[T.untyped]) }
     def cask_and_formula_dependencies
       return @cask_and_formula_dependencies if @cask_and_formula_dependencies
 
@@ -487,8 +500,6 @@ def finalize_upgrade
 
     sig { params(clear: T::Boolean, successor: T.nilable(Cask)).void }
     def uninstall_artifacts(clear: false, successor: nil)
-      artifacts = @cask.artifacts
-
       odebug "Uninstalling artifacts"
       odebug "#{::Utils.pluralize("artifact", artifacts.length, include_count: true)} defined", artifacts
 
diff --git a/Library/Homebrew/cask/quarantine.rb b/Library/Homebrew/cask/quarantine.rb
index 4a36a5128edac7..ae680b0d2321a6 100644
--- a/Library/Homebrew/cask/quarantine.rb
+++ b/Library/Homebrew/cask/quarantine.rb
@@ -266,3 +266,5 @@ def self.app_management_permissions_granted?(app:, command:)
     end
   end
 end
+
+require "extend/os/cask/quarantine"
diff --git a/Library/Homebrew/extend/os/cask/artifact/moved.rb b/Library/Homebrew/extend/os/cask/artifact/moved.rb
new file mode 100644
index 00000000000000..98d49e5904cbc1
--- /dev/null
+++ b/Library/Homebrew/extend/os/cask/artifact/moved.rb
@@ -0,0 +1,5 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "extend/os/mac/cask/artifact/moved" if OS.mac?
+require "extend/os/linux/cask/artifact/moved" if OS.linux?
diff --git a/Library/Homebrew/extend/os/cask/config.rb b/Library/Homebrew/extend/os/cask/config.rb
new file mode 100644
index 00000000000000..300aef685dba1c
--- /dev/null
+++ b/Library/Homebrew/extend/os/cask/config.rb
@@ -0,0 +1,5 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "extend/os/mac/cask/config" if OS.mac?
+require "extend/os/linux/cask/config" if OS.linux?
diff --git a/Library/Homebrew/extend/os/cask/quarantine.rb b/Library/Homebrew/extend/os/cask/quarantine.rb
new file mode 100644
index 00000000000000..31671b65e5d352
--- /dev/null
+++ b/Library/Homebrew/extend/os/cask/quarantine.rb
@@ -0,0 +1,4 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "extend/os/linux/cask/quarantine" if OS.linux?
diff --git a/Library/Homebrew/extend/os/linux/cask/artifact/moved.rb b/Library/Homebrew/extend/os/linux/cask/artifact/moved.rb
new file mode 100644
index 00000000000000..9c2313f4a82669
--- /dev/null
+++ b/Library/Homebrew/extend/os/linux/cask/artifact/moved.rb
@@ -0,0 +1,23 @@
+# typed: strict
+# frozen_string_literal: true
+
+module OS
+  module Linux
+    module Cask
+      module Artifact
+        module Moved
+          extend T::Helpers
+
+          requires_ancestor { ::Cask::Artifact::Moved }
+
+          sig { params(target: Pathname).returns(T::Boolean) }
+          def undeletable?(_target)
+            false
+          end
+        end
+      end
+    end
+  end
+end
+
+Cask::Artifact::Moved.prepend(OS::Linux::Cask::Config)
diff --git a/Library/Homebrew/extend/os/linux/cask/config.rb b/Library/Homebrew/extend/os/linux/cask/config.rb
new file mode 100644
index 00000000000000..3f61727e875cad
--- /dev/null
+++ b/Library/Homebrew/extend/os/linux/cask/config.rb
@@ -0,0 +1,43 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "os/linux"
+
+module OS
+  module Linux
+    module Cask
+      module Config
+        extend T::Helpers
+
+        requires_ancestor { ::Cask::Config }
+
+        DEFAULT_DIRS = T.let({
+          vst_plugindir:        "~/.vst",
+          vst3_plugindir:       "~/.vst3",
+          fontdir:              "#{ENV.fetch("XDG_DATA_HOME", "~/.local/share")}/fonts",
+          appdir:               nil,
+          keyboard_layoutdir:   nil,
+          colorpickerdir:       nil,
+          prefpanedir:          nil,
+          qlplugindir:          nil,
+          mdimporterdir:        nil,
+          servicedir:           nil,
+          dictionarydir:        nil,
+          screen_saverdir:      nil,
+          input_methoddir:      nil,
+          internet_plugindir:   nil,
+          audio_unit_plugindir: nil,
+        }.freeze, T::Hash[Symbol, T.nilable(String)])
+
+        sig { returns(T::Hash[Symbol, T.untyped]) }
+        def self.defaults
+          {
+            languages: LazyObject.new { Linux.languages },
+          }.merge(DEFAULT_DIRS).freeze
+        end
+      end
+    end
+  end
+end
+
+Cask::Config.prepend(OS::Linux::Cask::Config)
diff --git a/Library/Homebrew/extend/os/linux/cask/installer.rb b/Library/Homebrew/extend/os/linux/cask/installer.rb
index 536a08b1f5590e..635f40bf39070d 100644
--- a/Library/Homebrew/extend/os/linux/cask/installer.rb
+++ b/Library/Homebrew/extend/os/linux/cask/installer.rb
@@ -13,7 +13,9 @@ module Installer
 
         sig { void }
         def check_stanza_os_requirements
-          raise ::Cask::CaskError, "macOS is required for this software."
+          raise ::Cask::CaskError, "macOS is required for this software." unless artifacts.reject do |k|
+            k.is_a?(::Cask::Artifact::Font)
+          end.empty?
         end
       end
     end
diff --git a/Library/Homebrew/extend/os/linux/cask/quarantine.rb b/Library/Homebrew/extend/os/linux/cask/quarantine.rb
new file mode 100644
index 00000000000000..0fbed2ac4d2244
--- /dev/null
+++ b/Library/Homebrew/extend/os/linux/cask/quarantine.rb
@@ -0,0 +1,26 @@
+# typed: strict
+# frozen_string_literal: true
+
+module OS
+  module Linux
+    module Cask
+      module Quarantine
+        extend T::Helpers
+
+        requires_ancestor { ::Cask::Quarantine }
+
+        sig { returns(Symbol) }
+        def self.check_quarantine_support
+          :linux
+        end
+
+        sig { returns(T::Boolean) }
+        def self.available?
+          false
+        end
+      end
+    end
+  end
+end
+
+Cask::Quarantine.prepend(OS::Linux::Cask::Quarantine)
diff --git a/Library/Homebrew/extend/os/mac/cask/artifact/moved.rb b/Library/Homebrew/extend/os/mac/cask/artifact/moved.rb
new file mode 100644
index 00000000000000..f235220788779c
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/cask/artifact/moved.rb
@@ -0,0 +1,25 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "cask/macos"
+
+module OS
+  module Mac
+    module Cask
+      module Artifact
+        module Moved
+          extend T::Helpers
+
+          requires_ancestor { ::Cask::Artifact::Moved }
+
+          sig { params(target: Pathname).returns(T::Boolean) }
+          def undeletable?(target)
+            MacOS.undeletable?(target)
+          end
+        end
+      end
+    end
+  end
+end
+
+Cask::Artifact::Moved.prepend(OS::Mac::Cask::Config)
diff --git a/Library/Homebrew/extend/os/mac/cask/config.rb b/Library/Homebrew/extend/os/mac/cask/config.rb
new file mode 100644
index 00000000000000..9fe386bdd457ae
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/cask/config.rb
@@ -0,0 +1,46 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "cask/macos"
+
+module OS
+  module Mac
+    module Cask
+      module Config
+        extend T::Helpers
+
+        requires_ancestor { ::Cask::Config }
+
+        DEFAULT_DIRS = T.let(
+          {
+            appdir:               "/Applications",
+            keyboard_layoutdir:   "/Library/Keyboard Layouts",
+            colorpickerdir:       "~/Library/ColorPickers",
+            prefpanedir:          "~/Library/PreferencePanes",
+            qlplugindir:          "~/Library/QuickLook",
+            mdimporterdir:        "~/Library/Spotlight",
+            dictionarydir:        "~/Library/Dictionaries",
+            fontdir:              "~/Library/Fonts",
+            servicedir:           "~/Library/Services",
+            input_methoddir:      "~/Library/Input Methods",
+            internet_plugindir:   "~/Library/Internet Plug-Ins",
+            audio_unit_plugindir: "~/Library/Audio/Plug-Ins/Components",
+            vst_plugindir:        "~/Library/Audio/Plug-Ins/VST",
+            vst3_plugindir:       "~/Library/Audio/Plug-Ins/VST3",
+            screen_saverdir:      "~/Library/Screen Savers",
+          }.freeze,
+          T::Hash[Symbol, String],
+        )
+
+        sig { returns(T::Hash[Symbol, T.untyped]) }
+        def self.defaults
+          {
+            languages: LazyObject.new { MacOS.languages },
+          }.merge(DEFAULT_DIRS).freeze
+        end
+      end
+    end
+  end
+end
+
+Cask::Config.prepend(OS::Mac::Cask::Config)
diff --git a/Library/Homebrew/os/linux.rb b/Library/Homebrew/os/linux.rb
index e8f48328437070..dc10cc8658af49 100644
--- a/Library/Homebrew/os/linux.rb
+++ b/Library/Homebrew/os/linux.rb
@@ -56,5 +56,14 @@ def self.wsl_version
         Version::NULL
       end
     end
+
+    def self.languages
+      return @languages if @languages
+
+      os_langs = Utils.popen_read("localectl", "list-locales")
+      os_langs = os_langs.scan(/[^ \n"(),]+/).map { |item| item.split(".").first.tr("_", "-") }
+
+      @languages = os_langs
+    end
   end
 end