I Will Do Install Asterisk and FreePBX on Ubuntu 20.04

FreePBX.sh

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apt-get update -y
Step 2 – Install Required Dependencies
apt-get install unzip git gnupg2 curl libnewt-dev libssl-dev libncurses5-dev subversion libsqlite3-dev build-essential libjansson-dev libxml2-dev uuid-dev subversion -y

Step 3 – Install Asterisk
wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-17-current.tar.gz
tar zxf asterisk-17-current.tar.gz
cd asterisk-17.*/
contrib/scripts/get_mp3_source.sh
contrib/scripts/install_prereq install
./configure
make menuselect
##You can use Arrow key to navigate and Enter key to select.
##Enable require add-ons:
   │   Add-ons (See README-addons.txt)   |     --- Deprecated ---   
   
make menuselect
##Enable Core Sound Modules
   |   Core Sound Packages               |  CORE-SOUNDS-EN-SIREN7 

make menuselect
##Enable MOH packages
   |    Music On Hold File Packages     |   MOH-OPSOUND-G729 
 
make menuselect
 ##Extra Sound Packages
   │    Extras Sound Packages            |  EXTRA-SOUNDS-EN-G729                                                                                                                       ▒ │ EXTRA-SOUNDS-EN-G729 Save & Exit 
## Save & Exit 

make -j2
make samples
make config
ldconfig