So I'm trying to install pychecker to check a big python file my friend wanted me to check, but while trying to install pychecker using sudo apt-get install pychecker and sudo apt-get install -y pychecker and it returns E: Unable to locate package pychecker
pychecker is no longer included as a package in Ubuntu and Debian because it is unmaintained: the latest version is from 2011, and that version will not work with current versions of Python. From here:
Please consider moving away from Pychecker in favor of an alternative like Pylint [1]. Pychecker is basically unmaintained upstream. Also, it is only supported for Python 2, so it will reach its end of life along with Python 2 sometime in 2020.
...
Now is the time to convert. Pylint does everything that Pychecker used to do. The main effort required is to create your new configuration file and weed out warnings that you want to ignore.
Other alternatives include flake8.