E: Unable to locate package php7.2-mbstring E: Couldn't find any package by glob 'php7.2-mbstring' E: Couldn't find any package by regex 'php7.2-mbstring' code example
Example: E: Unable to locate package php7.2-mbstring
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"