/etc/lsb-release doesn't exist on some non-Ubuntu variants of linux.

tools/telemetry/telemetry/core/chrome/cros_browser_finder.py

Index: tools/telemetry/telemetry/core/chrome/cros_browser_finder.py
===================================================================
--- tools/telemetry/telemetry/core/chrome/cros_browser_finder.py	(revision 202623)
+++ tools/telemetry/telemetry/core/chrome/cros_browser_finder.py	(working copy)
@@ -5,6 +5,7 @@
 
 import logging
 import sys
+import os
 
 from telemetry.core import browser
 from telemetry.core import possible_browser
@@ -45,8 +46,9 @@
 def FindAllAvailableBrowsers(options):
   """Finds all available chromeos browsers, locally and remotely."""
   # Check if we are on a chromeos device.
-  if sys.platform.startswith('linux'):
-    with open('/etc/lsb-release', 'r') as f:
+  lsb_release = '/etc/lsb-release'
+  if sys.platform.startswith('linux') and os.path.exists(lsb_release):
+    with open(lsb_release, 'r') as f:
       res = f.read()
       if res.count('CHROMEOS_RELEASE_NAME'):
         return [PossibleCrOSBrowser('system', options,