Apache GuaCamole on Ubuntu 18

Install the following repository and packages-

sudo add-apt-repository ppa:remmina-ppa-team/remmina-next
sudo apt-get update
sudo apt-get install freerdp2-dev freerdp2-x11

Download file directly from here:

wget https://git.io/fxZq5 -O guac-install.sh

Make it executable:

chmod +x guac-install.sh

Run it as root:

Interactive (asks for passwords):

./guac-install.sh

Non-Interactive (values provided via cli):

./guac-install.sh --mysqlpwd password --guacpwd password --nomfa --installmysql

OR

./guac-install.sh -r password -gp password -o -i

Once installation is done you can access Guacamole by browsing to: http://<host_or_ip>:8080/guacamole/ The default credentials are guacadmin as both username and password. Please change them or disable guacadmin after install!

MFA/2FA
By default the script will not install MFA support (QR code for Google/Microsoft Authenticator, Duo Mobile, etc. or Duo Push), if you do want MFA support you can use the -t or –totp or for Duo -d or –duo flags on the command line. Or modify the script variables installTOTP=true or installDuo=true. Do not install both!

guac-upgrade
Script for upgrading currently installed Guacamole instance (previously installed via this script/guide). This will also now update the TOTP or Duo extensions if used.

A nice how to use it in action is right over here-

Ref:
https://github.com/MysticRyuujin/guac-install