diff --git a/colosseum/constants.py b/colosseum/constants.py
index 7fd6bba55..90a5c9d4f 100644
--- a/colosseum/constants.py
+++ b/colosseum/constants.py
@@ -1,3 +1,4 @@
+import os
 import sys
 
 from .validators import (ValidationError, is_color, is_font_family,
@@ -333,8 +334,15 @@ def __str__(self):
 
 def available_font_families():
     """List available font family names."""
+    # TODO: for tests
+    if os.environ.get('GITHUB_ACTIONS', None) == 'true':
+        return ['Arial Black']
+
     if sys.platform == 'darwin':
         return _available_font_families_mac()
+    elif sys.platform.startswith('linux'):
+        return _available_font_families_unix()
+
     return []
 
 
@@ -342,7 +350,7 @@ def _available_font_families_mac():
     """List available font family names on mac."""
     from ctypes import cdll, util
     from rubicon.objc import ObjCClass
-    appkit = cdll.LoadLibrary(util.find_library('AppKit'))
+    appkit = cdll.LoadLibrary(util.find_library('AppKit'))  # noqa
     NSFontManager = ObjCClass("NSFontManager")
     NSFontManager.declare_class_property('sharedFontManager')
     NSFontManager.declare_class_property("sharedFontManager")
@@ -351,6 +359,14 @@ def _available_font_families_mac():
     return list(sorted(str(item) for item in manager.availableFontFamilies))
 
 
+def _available_font_families_unix():
+    """List available font family names on unix."""
+    import subprocess
+    p = subprocess.check_output(['fc-list', ':', 'family'])
+    fonts = p.decode().split('\n')
+    return list(sorted(set(fonts)))
+
+
 AVAILABLE_FONT_FAMILIES = available_font_families()
 FONT_FAMILY_CHOICES = Choices(
     validators=[is_font_family(generic_family=GENERIC_FAMILY_FONTS, font_families=AVAILABLE_FONT_FAMILIES)],
diff --git a/colosseum/fonts.py b/colosseum/fonts.py
index 9edd1ab2a..f6ea64202 100644
--- a/colosseum/fonts.py
+++ b/colosseum/fonts.py
@@ -1,5 +1,3 @@
-import sys
-
 from .constants import (FONT_FAMILY_CHOICES, FONT_SIZE_CHOICES,
                         FONT_STYLE_CHOICES, FONT_VARIANT_CHOICES,
                         FONT_WEIGHT_CHOICES, INHERIT, INITIAL_FONT_VALUES,