我正在尝试在 ubuntu 06.04 上使用 composer update 更新 laravel，但每次运行时composer update总是出现此警告。
PHP Warning: PHP Startup: Unable to load dynamic library 'mcrypt.so' (tried: /usr/lib/php/20170718/mcrypt.so (/usr/lib/php/20170718/mcrypt.so: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/mcrypt.so.so (/usr/lib/php/20170718/mcrypt.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
有谁知道怎么处理？
我正在使用 php7.2