I want to install Qt5 on ubuntu 16.04

I would like to install Qt5 and Qtcreator on Jetson TX2.

There was someone who put Qt in Jetson, so I referred to the article below.
http://www.jetsonhacks.com/2017/01/31/install-qt-creator-nvidia-jetson-tx1/

The first step here is

 sudo apt-get install qt5-default qtcreator-y

It says, but it says (*) which is not on the list.

I did sudo apt-get update, sudo apt-get upgrade just before entering the command, but as a result of repository communication, qt5-default and qtcreator disappeared?
If so, would it be possible to return the repository?

( ))

Package qtcreator 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:
  qtchooser

E—Unable to locate package qt5-default
E: Package 'qtcreator' has no installation candidate