I'm working on a RaspberryPi. These are my OS informations: pi@raspberrypi:~ $ uname -m armv7l pi@raspberrypi:~ $ cat /etc/os-release PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)" NAME="Raspbian GNU/Linux" VERSION_ID="11" VERSION="11 (bullseye)" VERSION_CODENAME=bullseye ID=raspbian ID_LIKE=debian HOME_URL="http://www.raspbian.org/" SUPPORT_URL="http://www.raspbian.org/RaspbianForums" BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs" My actual Python version is: pi@raspberrypi:~ $ python --version Python 3.9.2 I would need to install Python 3.7 without uninstalling the current version. I simply want to install the 3.7 version and make it enabled. I tried sudo apt install python3.7 but it didn't work. How to do it? pi@raspberrypi:~ $ sudo apt install python3.7 Reading package lists... Done Building dependency tree... Done Reading state information... Done Package python3.7 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'python3.7' has no installation candidate Continue reading...