install-deps script issue on Ubuntu18.04

[candiceflower]

There is error message below when run the command via $bash install-deps on Ubuntu18.04.

`sudo apt-get install python-software-properties
Reading package lists... Done
Building dependency tree... Done
Package python-software-properties is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:

 software-properties-common

E: Package 'python-software-properties' has no installation candidate`

Issue will be gone after commenting the 140th line below in install-deps,
#sudo apt-get install -y python-software-properties