I am on a "Linux development environment" on ChromeOS, and I need to install a version of Python later than 3.7.7 to use a package (Since my default python version was 3.7.3). I have tried
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install python3
but got
python3 is already the newest version (3.7.3-1).
python3 set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
When I tried to install a version higher than 3.7, such as 3.9, I got
E: Unable to locate package python3.9
E: Couldn't find any package by glob 'python3.9'
E: Couldn't find any package by regex 'python3.9'
I faced the same exact problem when I used aptitude instead of apt.
I also tried building from source or using ppa(deadsnakes), which seems to be the orthodoxical fix, but neither worked on this device. Could you please help me install a new version using apt or any other package manager?
To install python3.9 through apt on debian, you need to upgrade your debian release to bullseye.
You can build python3.9 on Debian Buster following my answer on unix.stackexchange.com
Just replace the wget command by:
wget https://www.python.org/ftp/python/3.9.5/Python-3.9.5.tar.xz