Re: moodle 3.10 installation problem

Are you trying to install Moodle alongside other non-core plugins at the same time? I am a bit confused as to why you need to upgrade plugins.

Download the latest release (Moodle 3.10.1+) and do not add any other plugins. There should be no need to install other plugins when you first install Moodle - you can add them later - ideally individually. The best way to accomplish this is through git.

sudo apt install git

cd /var/www

git clone git://git.moodle.org/moodle.git

cd moodle

git branch --track MOODLE_310_STABLE origin/MOODLE_310_STABLE

git checkout MOODLE_310_STABLE

Alternatively, get from here: https://download.moodle.org/releases/latest/

You can also run the installer on the command line. I must confess I am a bit unfamiliar with the web installer because I don't use it. 

sudo chown -R $USER:$USER /var/www

sudo chmod -R 755 /var/www

sudo mkdir -p /var/moodledata

sudo chown -R $USER:$USER /var/moodledata

sudo chmod -R 777 /var/moodledata

rm -rf /var/moodledata/*
php /var/www/moodle/admin/cli/install.php