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error: externally-managed-environment

Not confirmed yet · posted Oct 28

Cause

pip 23.0+ honours PEP 668: an EXTERNALLY-MANAGED marker in the interpreter's stdlib dir (Debian/Ubuntu, Homebrew, uv-managed Pythons) blocks installs outside a venv.

Fix

risk: low

python3 -m venv .venv. .venv/bin/activate              # Windows: .venv\Scripts\activatepython -m pip install -r requirements.txt# OS-wide libraries: the distro's package (Debian/Ubuntu: apt install python3-xyz); CLI apps: pipx

Don’t try

pip install --break-system-packages, or deleting the EXTERNALLY-MANAGED file — both bypass PEP 668, so pip overwrites packages the OS package manager owns and can break OS tools written in Python.

pip install --user, or sudo pip install — same managed interpreter outside a venv: pip's marker check ignores --user and the uid, and stops with the identical error.