To display the current time on Ubuntu, you can open the terminal and use the date command.

Simply type the following command in your terminal:

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date

This will show the current date and time in the format of Day Month Date Hour:Minute:Seconds Timezone Year.

If you want to display the time in a specific format, you can use the + sign and a specific format string. For example, the following command will display only the current time in the HH:MM:SS format:

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date +%T

You can also display the time in a 12-hour format with AM/PM by using %r like this:

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date +%r

If you want to display the time continuously updating in the terminal, you can use the watch command. For example, the following command will update the time every 1 second:

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watch -n 1 date +%r

This will display the date and time in the HH:MM:SS AM/PM format, updating every 1 second. You can adjust the update frequency as per your requirement by modifying the -n option.