diff --git a/dangerzone/common.py b/dangerzone/common.py
index 9b479c7..637b26b 100644
--- a/dangerzone/common.py
+++ b/dangerzone/common.py
@@ -1,3 +1,4 @@
+import os
 import platform
 import tempfile
 
@@ -8,16 +9,27 @@ class Common(object):
     """
 
     def __init__(self):
-        # Temporary directory to store pixel data
-        # Note in macOS, temp dirs must be in /tmp (or a few other paths) for Docker to mount them
+        # Temporary directory to store pixel data and safe PDFs
         if platform.system() == "Windows":
             self.pixel_dir = tempfile.TemporaryDirectory(prefix="dangerzone-pixel-")
             self.safe_dir = tempfile.TemporaryDirectory(prefix="dangerzone-safe-")
-        else:
+        elif platform.system() == "Darwin":
+            # In macOS, temp dirs must be in /tmp (or a few other paths) for Docker to mount them
             self.pixel_dir = tempfile.TemporaryDirectory(
                 prefix="/tmp/dangerzone-pixel-"
             )
             self.safe_dir = tempfile.TemporaryDirectory(prefix="/tmp/dangerzone-safe-")
+        else:
+            # In Linux, temp dirs must be in the homedir for the snap package version of Docker to mount them
+            cache_dir = os.path.expanduser("~/.cache/dangerzone")
+            os.makedirs(cache_dir, exist_ok=True)
+            self.pixel_dir = tempfile.TemporaryDirectory(
+                prefix=os.path.join(cache_dir, "pixel-")
+            )
+            self.safe_dir = tempfile.TemporaryDirectory(
+                prefix=os.path.join(cache_dir, "safe-")
+            )
+
         print(
             f"Temporary directories created, dangerous={self.pixel_dir.name}, safe={self.safe_dir.name}"
         )
diff --git a/dangerzone/container.py b/dangerzone/container.py
index ab1bd98..a47f5b6 100644
--- a/dangerzone/container.py
+++ b/dangerzone/container.py
@@ -4,6 +4,7 @@ import subprocess
 import sys
 import pipes
 import getpass
+import shutil
 
 # What is the container runtime for this platform?
 if platform.system() == "Darwin":
@@ -11,7 +12,7 @@ if platform.system() == "Darwin":
 elif platform.system() == "Windows":
     container_runtime = "C:\\Program Files\\Docker\\Docker\\resources\\bin\\docker.exe"
 else:
-    container_runtime = "/usr/bin/docker"
+    container_runtime = shutil.which("docker")
 
 # Define startupinfo for subprocesses
 if platform.system() == "Windows":