FileNotFoundError: [Errno 2] No such file or directory: '/proc/self/mountinfo' FileNotFoundError: [Errno 2] No such file or directory: '/proc/self/mountinfo' FileNotFoundError: [Errno 2] No such file or directory: '/proc/self/mountinfo' FileNotFoundError: [Errno 2] No such file or directory: '/proc/self/mountinfo' ERROR: test_ram_dir (tests.test_util.TestComboLock.test_ram_dir) FileNotFoundError: [Errno 2] No such file or directory: '/proc/self/mountinfo' FAILED (errors=1) >>> ERROR: py3-combo-lock: check failed