Never pipe script that you don't trust to bash
The standard Debian container images on Proxmox don't have the locale properly set. It can be fixed with: proxmoxDebianFixLocale.txt
wget "https://www.230.ro/en/linux/nextcloud/install-nextcloud-debian/proxmoxDebianFixLocale.txt" -O - | bash
You might want to set a different timezone
echo "Europe/Bucharest" > /etc/timezone; dpkg-reconfigure -f noninteractive tzdata
Nextcould uses Nginx, PHP, MariaDB and Memcached. installDependencies.txt will install all of them for you.
wget "https://www.230.ro/en/linux/nextcloud/install-nextcloud-debian/installDependencies.txt" -O - | bash
We will create a new site and enable it. nextcloudNginxConfigrator.txt will do that for you. Added bonux, It will deploy an OPcache dashboard at /opcache/.
wget "https://www.230.ro/en/linux/nextcloud/install-nextcloud-debian/nextcloudNginxConfigrator.txt" -O - | bash
We will deploy the latest Nextcloud from download.nextcloud.com to /var/www/html. nextcloudDeploy.txt assumes the /var/www/html folder is empty.
wget "https://www.230.ro/en/linux/nextcloud/install-nextcloud-debian/nextcloudDeploy.txt" -O - | bash