Install latest/stable of xclock-simosx
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install xclock-simosx
Don't have snapd? Get set up for snaps.
The xclock package contains a simple clock application which is used in the default xinit configuration. This package is not a part of the Xorg katamari and is provided only as a dependency to other packages or for testing the completed Xorg installation.
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.