getting error while updating Composer

Question

I have a project in Laravel-5.1 and I have changed my platform from win10 to Ubuntu.

Showing error:

Loading composer repositories with package inf

Answer 1

If you're using php 7.3 for laravel 5.7. this work for me

sudo apt-get install php-gd php-xml php7.3-mbstring

Answer 2

for php7 you can do that:

sudo apt-get install php-gd php-xml php7.0-mbstring

Answer 3

This works for me with php 7.2

sudo apt-get install php7.2-xml