mjhjmtu

I want to develop my OwnCloud client so I cloned a client of OwnCloud repository from GitHub and I read this documentation. Firstly, I want to say my system property. I am using Ubuntu 18.04 LTS (64 bit) so I tried Ubuntu steps in this documentation.

I tried steps at the below.

I added source link to source list of system.

echo 'deb-src http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_18.04/ /' >> /etc/apt/sources.list.d/owncloud-client.list

Then, I updated my system.

apt-get update;

Lastly, I tried build-dep function. Because, OwnCloud documentation says this command.

 apt-get build-dep owncloud-client

First two steps worked successfully but at last step, I am getting an error.

Reading package lists... Done 
Reading package lists... Done

Building dependency tree 
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 builddeps:owncloud-client : Depends: ocqt5101-qt5-qmake but it is not installable
 Depends: ocqt5101-qttools5-dev-tools but it is not installable
 Depends: ocqt5101-qtbase5-dev but it is not installable
 Depends: ocqt5101-qt5keychain-dev (>= 0.7.0) but it is not installable
 Depends: ocqt5101-libqt5webkit5-dev (>= 2.2.0) but it is not installable
 Depends: ocqt5101-qtsvg5 but it is not installable
E: Unable to correct problems, you have held broken packages.

I tried to compile this dependencies manually like that

sudo apt-get build-dep ocqt5101-qt5-qmake

but it is not working. I am getting same result.

How can I build this sources? Please, help me! Thanks.