sysstat
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sar package
Under Ubuntu the sar command is part of the sysstat package. Do not confuse this with atsar, which is obsolete and unmaintained.
Requested activities not available in file
This happens most often when sysstat was not configured to record the given data. For example, `sar -b` or `sar -d`. You must edit /etc/cron.d/sysstat and add the option to store the given dataset.