The mbstring extension is missing. Please check your PHP configuration.
I have also enabled these as instructed in other sites by
shubhendu@shubhendu-HP-Pavilion-g6-Notebook-PC:~$ sudo nano /etc/php/7.0/apache2/php.ini
extension=php_mbstring.dll
extension=php_exif.dll ; Must be after mbstring as it depends on it
extension=php_mysqli.dll
Tried the solution given here.mbstring is missing for phpmyadmin in ubuntu 16.04
shubhendu@shubhendu-HP-Pavilion-g6-Notebook-PC:~$ sudo apt-get install php-mbstring php7.0-mbstring php-gettext libapache2-mod-php7.0
is giving this result.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'php7.0-common' instead of 'php-gettext'
E: Unable to locate package php-mbstring
E: Unable to locate package php7.0-mbstring
E: Couldn't find any package by glob 'php7.0-mbstring'
E: Couldn't find any package by regex 'php7.0-mbstring'
then I tried those steps
shubhendu@shubhendu-HP-Pavilion-g6-Notebook-PC:~$ sudo phpenmod mcrypt
and then
shubhendu@shubhendu-HP-Pavilion-g6-Notebook-PC:~$ sudo phpenmod mbstring
which gave this output.
WARNING: Module mbstring ini file doesn't exist under /etc/php/7.0/mods-available
WARNING: Module mbstring ini file doesn't exist under /etc/php/7.0/mods-available
