Have tried all possible ways but getting error for memory caching as pasted below :-
Internal Server Error
The server encountered an internal error and was unable to complete your request. Please contact the server administrator if this error reappears multiple time, please include the technical detials below in your report. More details can be found in the server log
You do not really need Memory Caching if you not want. It is only a performance issue.
I think very easy is APCu. Perhaps you have not installed php-apcu
The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.
INFORMATION ABOUT IMAGEMAGICK :-
imagemagick is already the newest version (8:6.9.10.23+dfsg-2.1ubuntu11.4).
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
You also need to install the package php-imagick resp. php5-imagick, if you are using PHP5.
Maybe there are depencies, which must be installed previously.
On my Univention server Nextcloud is running in Docker, wherein I also had to install php-imagick a time ago (package was missing in a Docker-update of Nextcloud).