diff --git a/README.md b/README.md
index 57faecc..9e3c2bc 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,14 @@ setup-usl-mm_install_requirements ->
 configure main and universe repo in sources.list,
 install dialog utility
 
-setup-usl-mm
+usl-mm-bionic-upgrade ->
+replace current release codename with codename in first argument
+upgrade LXD to 4.0 SNAP version
+upgrade system
+replace some lines in /root/onstart
+reboot
+
+setup-usl-mm ->
 1. Pre-reboot script ->
 install zfs-utils,
 change timezone to Prague,
diff --git a/usl-mm-bionic-upgrade b/usl-mm-bionic-upgrade
new file mode 100755
index 0000000..b44524c
--- /dev/null
+++ b/usl-mm-bionic-upgrade
@@ -0,0 +1,62 @@
+#!/bin/bash
+# Use with first argument with codename of new ubuntu distro(eoan,focal, etc)
+IFS='
+'
+current_release=$(lsb_release -c | awk {'print $2'})
+export DEBIAN_FRONTEND=noninteractive
+apt update
+apt dist-upgrade -y -o Dpkg::Options::="--force-confold"
+apt install rpl -y
+snap install --channel 4.0/stable lxd
+if [ $current_release == bionic ]; then
+lxd.migrate -yes
+fi
+zfs set mountpoint=/var/snap/lxd/common/lxd crypt/lxd/dir
+rpl $current_release $1 /etc/apt/sources.list
+rpl $current_release $1 /etc/apt/sources.list.d/*
+apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 82562EA9AD986DA3
+apt update
+apt dist-upgrade -y -o Dpkg::Options::="--force-confold"
+
+echo "Creating onstart-new script in /root"
+echo "#!/bin/bash" > /root/onstart-new
+echo "read -p \"Press any button to start...\"" >> /root/onstart-new
+echo "pass_var=\$(dialog --passwordbox \"Enter password:\" 25 25  --output-fd 1)" >> /root/onstart-new
+echo "pass_var2=\$(dialog --passwordbox \"Enter password again:\" 25 25  --output-fd 1)" >> /root/onstart-new
+echo "if [ \"\$pass_var\" == \"\$pass_var2\" ]; then" >> /root/onstart-new
+echo "echo \"Passwords match!\""  >> /root/onstart-new
+echo "else"  >> /root/onstart-new
+echo "echo \"Passwords not match!\"" >> /root/onstart-new
+echo "exit 1" >> /root/onstart-new
+echo "fi"  >> /root/onstart-new
+echo "echo \"Stopping LXD snap daemon and deleting /var/snap/lxd/common/lxd/*\"" >> /root/onstart-new
+echo "snap disable lxd" >> /root/onstart-new
+echo "rm /var/snap/lxd/common/lxd/* -rf" >> /root/onstart-new
+echo "echo \"Opening encrypted partition\"" >> /root/onstart-new
+for i in $(cat /root/onstart | grep "cryptsetup open")
+do echo "$i" >> /root/onstart-new
+done
+echo "partprobe" >> /root/onstart-new
+for i in $(cat /root/onstart | grep "zpool import")
+do echo "$i" >> /root/onstart-new
+done
+echo "snap enable lxd" >> /root/onstart-new
+for i in $(cat /root/onstart | grep "iptables")
+do echo "$i" >> /root/onstart-new
+done
+for i in $(cat /root/onstart | grep "firewall")
+do echo "$i" >> /root/onstart-new
+done
+
+chmod +x /root/onstart-new
+
+mv /root/onstart /root/onstart-old
+mv /root/onstart-new /root/onstart
+
+zfs set mountpoint=/var/snap/lxd/common/lxd crypt/lxd/dir
+
+snap switch --channel 4.0/stable lxd
+snap refresh
+
+read -p "Press any key for reboot"
+reboot