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i think that guide is not really updated. im not sure if teampass itself is still being developed

today i installed the latest version on ubuntu 20 lts without worrying about the module. are you sure it is still needed?

this is what i did: sudo apt-get install apache2 mariadb-server php php-cli libapache2-mod-php php-mysql php-curl php-mbstring php-bcmath php-common php-gd php-xml git