diff --git a/testing/README.md b/testing/README.md
index 1e6d8256..e0820d4e 100644
--- a/testing/README.md
+++ b/testing/README.md
@@ -3,6 +3,9 @@
 
 None of this code ships on the product itself, but it does get used for testing purposes.
 
+## Dependencies
+* 7z
+
 ## Background
 
 - pytest is used to track test cases and fixtures, etc
diff --git a/testing/conftest.py b/testing/conftest.py
index 64ac7c56..415a8960 100644
--- a/testing/conftest.py
+++ b/testing/conftest.py
@@ -1,6 +1,6 @@
 # (c) Copyright 2020 by Coinkite Inc. This file is covered by license found in COPYING-CC.
 #
-import pytest, glob, time, sys, random, re
+import pytest, glob, time, sys, random, re, ndef
 from pprint import pprint
 from ckcc.protocol import CCProtocolPacker, CCProtoError
 from helpers import B2A, U2SAT, prandom
@@ -418,7 +418,10 @@ def qr_quality_check():
     scale=3
     rv = Image.new('RGB', (w*scale, ((h*scale)+TH)*count), color=(64,64,64))
     y = 0
-    fnt = ImageFont.truetype('Courier', size=10)
+    try:
+        fnt = ImageFont.truetype('Courier', size=10)
+    except:
+        fnt = ImageFont.load_default()
     dr = ImageDraw.Draw(rv)
     mw = int((w*scale) / dr.textsize('M', fnt)[0])
 
@@ -866,7 +869,6 @@ def decode_with_bitcoind(bitcoind):
     def doit(raw_txn):
         # verify our understanding of a TXN (and esp its outputs) matches
         # the same values as what bitcoind generates
-
         try:
             return bitcoind.decoderawtransaction(B2A(raw_txn))
         except ConnectionResetError:
@@ -947,7 +949,6 @@ def try_sign_microsd(open_microsd, cap_story, pick_menu_item, goto_home, need_ke
     # like "try_sign" but use "air gapped" file transfer via microSD
 
     def doit(f_or_data, accept=True, finalize=False, accept_ms_import=False, complete=False, encoding='binary', del_after=0):
-
         if f_or_data[0:5] == b'psbt\xff':
             ip = f_or_data
             filename = 'memory'
@@ -965,7 +966,7 @@ def try_sign_microsd(open_microsd, cap_story, pick_menu_item, goto_home, need_ke
         pat = microsd_path(psbtname+'*.psbt')
         for f in glob(pat):
             assert 'psbt' in f
-            os.unlink(f)
+            os.remove(f)
 
         if encoding == 'hex':
             ip = b2a_hex(ip)
@@ -986,8 +987,7 @@ def try_sign_microsd(open_microsd, cap_story, pick_menu_item, goto_home, need_ke
         if 'Choose PSBT file' in story:
             need_keypress('y')
             time.sleep(.1)
-            
-        pick_menu_item(psbtname+'.psbt')
+            pick_menu_item(psbtname+'.psbt')
 
         time.sleep(.1)
         
@@ -1305,7 +1305,7 @@ def nfc_write(request, only_mk4):
 @pytest.fixture()
 def nfc_read_json(nfc_read):
     def doit():
-        import ndef, json
+        import json
         got = list(ndef.message_decoder(nfc_read()))
         assert len(got) == 1
         got = got[0]
@@ -1317,7 +1317,6 @@ def nfc_read_json(nfc_read):
 @pytest.fixture()
 def nfc_read_text(nfc_read):
     def doit():
-        import ndef
         got = list(ndef.message_decoder(nfc_read()))
         assert len(got) == 1
         got = got[0]
diff --git a/testing/devtest/backups.py b/testing/devtest/backups.py
index ac85f56b..590e856c 100644
--- a/testing/devtest/backups.py
+++ b/testing/devtest/backups.py
@@ -98,7 +98,7 @@ async def test_7z():
 
             if had_policy:
                 from hsm import POLICY_FNAME
-                uos.unlink(POLICY_FNAME)
+                uos.remove(POLICY_FNAME)
                 assert not hsm.hsm_policy_available()
 
             with SFFile(0, ll) as fd:
diff --git a/testing/requirements.txt b/testing/requirements.txt
index fbe0d4e3..46dbd93c 100644
--- a/testing/requirements.txt
+++ b/testing/requirements.txt
@@ -13,7 +13,8 @@ zbar-py==1.0.4
 
 # NFC and NDEF handling
 nfcpy==1.0.3
-ndef==0.2
+# commentt out below dependency 'ndef==0.2' if on debian based OS
+#ndef==0.2
 
 # optional, and only helpful if you have a desktop NFC-V capable reader
 pyscard==2.0.2
diff --git a/testing/test_export.py b/testing/test_export.py
index 21515061..58c58111 100644
--- a/testing/test_export.py
+++ b/testing/test_export.py
@@ -464,7 +464,7 @@ def test_export_public_txt(dev, cap_menu, pick_menu_item, goto_home, cap_story,
     time.sleep(0.1)
     title, story = cap_story()
 
-    assert 'Saves a text file to' in story
+    assert 'Saves a text file' in story
     need_keypress('y')
 
     time.sleep(0.1)
diff --git a/testing/test_hsm.py b/testing/test_hsm.py
index b7b84e61..869c591d 100644
--- a/testing/test_hsm.py
+++ b/testing/test_hsm.py
@@ -57,7 +57,7 @@ def hsm_reset(dev, sim_exec):
         # make sure we can setup an HSM now; often need to restart simulator tho
 
         # clear defined config
-        cmd = 'import uos, hsm; uos.unlink(hsm.POLICY_FNAME)'
+        cmd = 'import uos, hsm; uos.remove(hsm.POLICY_FNAME)'
         sim_exec(cmd)
 
         # reset HSM code, to clear previous HSM setup
@@ -74,7 +74,7 @@ def hsm_reset(dev, sim_exec):
     yield doit
 
     try:
-        cmd = 'import uos, hsm; uos.unlink(hsm.POLICY_FNAME)'
+        cmd = 'import uos, hsm; uos.remove(hsm.POLICY_FNAME)'
         sim_exec(cmd)
     except:
         pass
diff --git a/testing/test_rng.py b/testing/test_rng.py
index 1a602302..aa2f20a9 100644
--- a/testing/test_rng.py
+++ b/testing/test_rng.py
@@ -5,7 +5,7 @@
 # - needs "dieharder" installed, see 
 #   <https://webhome.phy.duke.edu/~rgb/General/dieharder.php>
 # - on mac: "brew install dieharder"
-#
+# - on ubuntu20: "sudo apt-get install dieharder"
 import pytest, subprocess, os
 from helpers import B2A
 
diff --git a/unix/variant/ffilib.py b/unix/variant/ffilib.py
index dc4d672a..ab6837d4 100644
--- a/unix/variant/ffilib.py
+++ b/unix/variant/ffilib.py
@@ -14,7 +14,7 @@ def open(name, maxver=10, extra=()):
     except KeyError:
         pass
     def libs():
-        if sys.platform == "linux":
+        if sys.platform in ["linux", "linux2", "coldcard-unix"]:
             yield '%s.so' % name
             for i in range(maxver, -1, -1):
                 yield '%s.so.%u' % (name, i)