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puavo-os
Puavo OS is an disk image based operating system that is built from Debian GNU/Linux and is specifically designed for learning.
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InfluxDB
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In Finland, a Linux distribution called Puavo OS based on Debian is quite widely used in primary and seconday schools. It is an open source project of Jyväskylä-based Opinsys Oy and it is sold as a service where pre-owned laptops and desktops are sold with a maintenance contract for a monthly price per student. Puavo OS is a very reasonable solution for schools, because it has a strongly integrated management software, synchronization of usernames and directories from the server, and all programs pre-installed. Pre-owned Thinkpads and HP Elitebooks are significantly more affordable than new Windows machines and their maintenance costs are only a fraction of Windows machines. In addition to Finland, Puavo OS is also used in some schools in Switzerland and Germany. Here's a good video about Puavo OS.