Owncloud repository is not working

Steps to reproduce

after integrate your repository on deb https://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/
update apt database etc., the owncloud package was not found

Expected behaviour

Tell us what should happen
after apt install owncloud
the package have to be installed

Actual behaviour

Tell us what happens instead
apt-cache policy owncloud
Installed: (none)
Candidate: (none)
Version table:

apt install owncloud
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package owncloud 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:

E: Package 'owncloud' has no installation candidate

Server configuration

ubuntu server 16.04.3 64bit

Web server:
PHP version:
ownCloud version: (see ownCloud admin page)
Updated from an older ownCloud or fresh install:
Where did you install ownCloud from:
your repo
I think the error is on your repository. try to install on a virtual machine to see the problem.
best regard

I think the owncloud package is gone, you can install owncloud-files. (it's just owncloud without the dependencies)