I have recently updated my Ubuntu from 19.10 to 20.04. During the installation and now when I am running apt update I see python related warnings:
/usr/lib/python3.8/subprocess.py:838: RuntimeWarning: line buffering (buffering=1) isn't supported in binary mode, the default buffer size will be used self.stdin = io.open(p2cwrite, 'wb', bufsize)How can I fix that ?
12 Answers
Here, you can see a discussion about that:
And here a fix:
But remember ... it is not a bug, it's a feature :)
I have no such problem with "apt update" in 20.4
shell> cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"In my case, the problem was caused by the Ansible plugin mitogen
shell> ansible-playbook --version
ansible-playbook 2.9.6 config file = /home/admin/.ansible.cfg configured module search path = ['/home/admin/.ansible/my_modules'] ansible python module location = /usr/lib/python3/dist-packages/ansible executable location = /usr/bin/ansible-playbook python version = 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0]
shell> ansible localhost -m setup/usr/lib/python3.8/os.py:1023: RuntimeWarning: line buffering (buffering=1) isn't supported in binary mode, the default buffer size will be used return io.open(fd, *args, **kwargs)
The problem disappeared when I disabled mitogen
shell> grep strategy ansible.cfg
# strategy = mitogen_linear
