Most of digital competence frameworks for compulsory education embedded problem-solving skills. However, none of these frameworks specify in which digital environments must the students be able to problem solve. Thus, this skill should certainly be demonstrable in a variety of operating systems (OS). The standardization of digital learning environments organized by public schools often limits this ambition. So, a variety of digital learning environments were chosen, designed and developed with openness and plurality in mind. A large diversity of Linux distros exists and knowing them might be part of a digital culture to promote an ambitious digital citizenship. If the OS are free, the hardware might be expensive. Going with Raspberry Pi micro-computers, the openness to other OS becomes suddenly possible and can be organized with fewer expenses. To design the user interfaces on the Pi, the successive approximation (threephase) model has been chosen as a process. Several Linux distros were tested with clear pedagogical intentions. Three interfaces were selected: Ubuntu, Manjaro, Raspbian OS. Interfaces tests will be carried out in classrooms between now and the congress and the communication will invite participants to experiment these.