i have a very big problem.
I wanted to install a board software for my website named ABXD-legacy.
but since it is old, it requires an older version of mysql and php.
so i installed an older version of php, and found a tutorial to install an old version of mysql, so first it needed to unistall the version i have so i did it, but what i forgot is that it also deleted ALL MY DATABASES! and then when i wanted to install the old version it didn't worked! and while trying to reinstall the latest version of mysql i get errors like:
dpkg: error processing package mysql-workbench-community (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
mysql-common
mysql-community-server
libmysqlclient20:amd64
mysql-server
mysql-workbench-community
E: Sub-process /usr/bin/dpkg returned an error code (1)
and on phpmyadmin i get the error "The mbstring extension is missing. Please check your PHP configuration."
i found many solutions for this problem on internet but nothing worked! help me please it is very important!