Steps to install Composer ubuntu 20.4

 

sudo apt-get remove composer

• Download the installer to the current directory

• php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"

  
   
• Verify the installer SHA-384, which you can also https://getcomposer.org/download/
  

  php -r "if (hash_file('sha384', 'composer-setup.php') === '55ce33d7678c5a611085589f1f3ddf8b3c52d662cd01d4ba75c0ee0459970c2200a51f492d557530c71c15d8dba01eae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"

• Run the installer

• php composer-setup.php 

  Remove the installer

  
  

php -r "unlink('composer-setup.php');"

 sudo apt install composer

Refderences:

https://getcomposer.org/download/ 

sudo composer self-update 

-------------------------------------------------------------------------------

composer install error

1. sudo apt install wget php-cli php-zip unzip
2. php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
3. HASH="$(wget -q -O - https://composer.github.io/installer.sig)"
4. php -r "if (hash_file('SHA384', 'composer-setup.php') === '$HASH') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"

Installer verified

5. sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer

All settings correct for using Composer
Downloading...
Composer (version 2.0.14) successfully installed to: 
/usr/local/bin/composer
Use it: php /usr/local/bin/composer

To remove packages that have dpkg congigure issues

 REMOVE

sudo apt-get autoremove "NAME OF PACKAGE HERE"

 RECONFIGURE

sudo dpkg-reconfigure -phigh -a

Install PHP 7.4 in ubuntu 20.04

1)sudo apt update

2)sudo apt install php7.4

3)sudo apt install php7.4-common php7.4-mysql php7.4-xml php7.4-xmlrpc php7.4-curl php7.4-gd php7.4-imagick php7.4-cli php7.4-dev php7.4-imap php7.4-mbstring php7.4-opcache php7.4-soap php7.4-zip php7.4-intl -y