diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0780ffdf..4ccf79ee2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 CHANGELOG
 =========
 
+v0.26b (January 25, 2018)
+-------------------------
+
+* Fix new installations which broke at the step of asking for the user's desired email address, which was broken by v0.26's changes related to the control panel.
+* Fix the provisioning of TLS certificates by pinning a Python package we rely on (acme) to an earlier version because our code isn't yet compatible with its current version.
+* Reduce munin's log_level from debug to warning to prevent massive log files.
+
 v0.26 (January 18, 2018)
 ------------------------
 
@@ -24,7 +31,7 @@ Installer:
 * We now run `apt-get autoremove` at the start of setup to clear out old packages, especially old kernels that take up a lot of space. On the first run, this step may take a long time.
 * We now fetch Z-Push from its tagged git repository, fixing an installation problem.
 * Some old PHP5 packages are removed from setup, fixing an installation bug where Apache would get installed.
-* Python 3 packages for the control panel are now installed using a virtualenv to prevent installation errors.
+* Python 3 packages for the control panel are now installed using a virtualenv to prevent installation errors due to conflicts in the cryptography/openssl packages between OS-installed packages and pip-installed packages.
 
 v0.25 (November 15, 2017)
 -------------------------
diff --git a/README.md b/README.md
index 49f4358b5..84f4f702a 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Quick Install
 git clone https://github.com/jirislav/mailinabox.git
 cd mailinabox
 
-git checkout v0.26-ubuntu16
+git checkout v0.26b-ubuntu16
 
 # Run installation
 setup/start.sh
diff --git a/management/mailconfig.py b/management/mailconfig.py
index fc75e1ab7..82c922e4a 100755
--- a/management/mailconfig.py
+++ b/management/mailconfig.py
@@ -1,5 +1,14 @@
 #!/usr/local/lib/mailinabox/env/bin/python
 
+# NOTE:
+# This script is run both using the system-wide Python 3
+# interpreter (/usr/bin/python3) as well as through the
+# virtualenv (/usr/local/lib/mailinabox/env). So only
+# import packages at the top level of this script that
+# are installed in *both* contexts. We use the system-wide
+# Python 3 in setup/questions.sh to validate the email
+# address entered by the user.
+
 import subprocess, shutil, os, sqlite3, re
 import utils
 from email_validator import validate_email as validate_email_, EmailNotValidError
diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index 12c25f20c..84dae634c 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -7,7 +7,7 @@
 #########################################################
 
 if [ -z "$TAG" ]; then
-	TAG=v0.26
+	TAG=v0.26b
 fi
 
 # Are we running as root?
diff --git a/setup/management.sh b/setup/management.sh
index 471a2f243..c3144f762 100755
--- a/setup/management.sh
+++ b/setup/management.sh
@@ -59,7 +59,7 @@ hide_output $venv/bin/pip install --upgrade setuptools
 hide_output $venv/bin/pip install --upgrade \
 	rtyaml "email_validator>=1.0.0" "free_tls_certificates>=0.1.3" "exclusiveprocess" \
 	flask dnspython python-dateutil \
-	"idna>=2.0.0" "cryptography>=1.0.2" acme boto psutil
+	"idna>=2.0.0" "cryptography>=1.0.2" "acme==0.20.0" boto psutil
 
 # CONFIGURATION
 
diff --git a/setup/munin.sh b/setup/munin.sh
index 9b26ecb2a..7eb2423eb 100755
--- a/setup/munin.sh
+++ b/setup/munin.sh
@@ -38,8 +38,10 @@ chown munin. /var/log/munin/munin-cgi-html.log
 chown munin. /var/log/munin/munin-cgi-graph.log
 
 # ensure munin-node knows the name of this machine
+# and reduce logging level to warning
 tools/editconf.py /etc/munin/munin-node.conf -s \
-	host_name=$PRIMARY_HOSTNAME
+	host_name=$PRIMARY_HOSTNAME \
+	log_level=1
 
 # Update the activated plugins through munin's autoconfiguration.
 munin-node-configure --shell --remove-also 2>/dev/null | sh
diff --git a/setup/questions.sh b/setup/questions.sh
index 57da5c927..3d227d815 100644
--- a/setup/questions.sh
+++ b/setup/questions.sh
@@ -12,7 +12,9 @@ if [ -z "$NONINTERACTIVE" ]; then
 		apt_get_quiet install dialog python3 python3-pip  || exit 1
 	fi
 
-	# email_validator is repeated in setup/management.sh
+	# Installing email_validator is repeated in setup/management.sh, but in setup/management.sh
+	# we install it inside a virtualenv. In this script, we don't have the virtualenv yet
+	# so we install the python package globally.
 	hide_output pip3 install "email_validator>=1.0.0" || exit 1
 
 	message_box "Mail-in-a-Box Installation" \
@@ -49,7 +51,7 @@ you really want.
 			# user hit ESC/cancel
 			exit
 		fi
-		while ! management/mailconfig.py validate-email "$EMAIL_ADDR"
+		while ! python3 management/mailconfig.py validate-email "$EMAIL_ADDR"
 		do
 			input_box "Your Email Address" \
 				"That's not a valid email address.\n\nWhat email address are you setting this box up to manage?" \