Solve the "var / log / sysstat / sa21: No such file or directory Please check whether to allow data collection"

Some want to use sar to see some of the activities of information systems, found an error. Record it

Use apt install sysstat for the first time after being given the / var / log / sysstat / sa21 : No such file or directory Please check whether to allow data collection, vim to go to the file in the / etc to modify the configuration

here into a true

retry it again it