diff --git a/management/backup.py b/management/backup.py
index 26a61a0..ce358e0 100755
--- a/management/backup.py
+++ b/management/backup.py
@@ -12,7 +12,7 @@ import dateutil.parser, dateutil.relativedelta, dateutil.tz
 import rtyaml
 from exclusiveprocess import Lock
 
-from utils import load_environment, shell, wait_for_service, fix_boto
+from utils import load_environment, shell, wait_for_service
 
 def backup_status(env):
 	# If backups are dissbled, return no status.
@@ -197,12 +197,7 @@ def get_duplicity_target_url(config):
 		from urllib.parse import urlsplit, urlunsplit
 		target = list(urlsplit(target))
 
-		# Duplicity now defaults to boto3 as the backend for S3, but we have
-		# legacy boto installed (boto3 doesn't support Ubuntu 18.04) so
-		# we retarget for classic boto.
-		target[0] = "boto+" + target[0]
-
-		# In addition, although we store the S3 hostname in the target URL,
+		# Although we store the S3 hostname in the target URL,
 		# duplicity no longer accepts it in the target URL. The hostname in
 		# the target URL must be the bucket name. The hostname is passed
 		# via get_duplicity_additional_args. Move the first part of the
@@ -452,7 +447,6 @@ def list_target_files(config):
 
 	elif target.scheme == "s3":
 		# match to a Region
-		fix_boto() # must call prior to importing boto
 		import boto.s3
 		from boto.exception import BotoServerError
 		custom_region = False
diff --git a/management/daemon.py b/management/daemon.py
index 0bbb1ad..98c6689 100755
--- a/management/daemon.py
+++ b/management/daemon.py
@@ -121,7 +121,6 @@ def index():
 	no_users_exist = (len(get_mail_users(env)) == 0)
 	no_admins_exist = (len(get_admins(env)) == 0)
 
-	utils.fix_boto() # must call prior to importing boto
 	import boto.s3
 	backup_s3_hosts = [(r.name, r.endpoint) for r in boto.s3.regions()]
 
diff --git a/management/utils.py b/management/utils.py
index 652b48f..fc04ed4 100644
--- a/management/utils.py
+++ b/management/utils.py
@@ -175,14 +175,6 @@ def wait_for_service(port, public, env, timeout):
 				return False
 		time.sleep(min(timeout/4, 1))
 
-def fix_boto():
-	# Google Compute Engine instances install some Python-2-only boto plugins that
-	# conflict with boto running under Python 3. Disable boto's default configuration
-	# file prior to importing boto so that GCE's plugin is not loaded:
-	import os
-	os.environ["BOTO_CONFIG"] = "/etc/boto3.cfg"
-
-
 if __name__ == "__main__":
 	from web_update import get_web_domains
 	env = load_environment()
diff --git a/setup/management.sh b/setup/management.sh
index 046c5ba..483a9c5 100755
--- a/setup/management.sh
+++ b/setup/management.sh
@@ -30,7 +30,7 @@ apt_install duplicity python-pip virtualenv certbot rsync
 # b2sdk is used for backblaze backups.
 # boto is used for amazon aws backups.
 # Both are installed outside the pipenv, so they can be used by duplicity
-hide_output pip3 install --upgrade b2sdk==1.14.1 boto
+hide_output pip3 install --upgrade b2sdk boto
 
 # Create a virtualenv for the installation of Python 3 packages
 # used by the management daemon.
@@ -52,7 +52,7 @@ hide_output $venv/bin/pip install --upgrade \
 	flask dnspython python-dateutil expiringdict \
 	qrcode[pil] pyotp \
 	"idna>=2.0.0" "cryptography==2.2.2" psutil postfix-mta-sts-resolver \
-	b2sdk==1.14.1 boto
+	b2sdk boto
 
 # CONFIGURATION
 
diff --git a/setup/system.sh b/setup/system.sh
index 4e43808..b128a6b 100755
--- a/setup/system.sh
+++ b/setup/system.sh
@@ -97,9 +97,6 @@ fi
 # come from there and minimal Ubuntu installs may have it turned off.
 hide_output add-apt-repository -y universe
 
-# Install the certbot PPA.
-hide_output add-apt-repository -y ppa:certbot/certbot
-
 # Install the duplicity PPA.
 hide_output add-apt-repository -y ppa:duplicity-team/duplicity-release-git