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

After installing packages from given answers, i still get some errors then i install following package and it works fine:

• php-xml

for specific version:

• php7.0-xml

command for php 7.0

sudo apt-get install php7.0-xml

in some cases you also needs a package php7.0-common . install it same as above command.