[humanpuff69]

The plugin installation problem has been solved by these commands.
But i still have the theme installation problem.I have changed the max file upload size via a plugin but that is useless.It is not working.Still searching for the solution.

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A lot of thanks.You are right the plugin installation problem has been fixed by chown.But still facing the theme installation problem.In past i fixed that theme installation problem by increasing the size from a file.I don't remember.But i am unable to find now.

try changung the max upload from the php.ini instead , it should located on /etc/php . Or you can force add it on your nginx/apache config