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For an ordinary user on Ubuntu 18.04.1 the tab key doesn't work for a command argument.

For example, entering systemctl sta and pressing the tab doesn't produce a match for "start status".

It works for the root user. The example below is for the root user:

systemctl sta<press tab key>
start status

The above functions as expected.
However, it doesn't work for a non-root user.
systemctl sta<press tab key>
did not match any argument.

It happened after updating from 16.04 to 18.04.1.

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