Duplicati will not installed after upgrade from OMV 3 to OMV 4

Hi,
Today I’ve upgraded to release 4. OMV is installed on my Raspberry Pi.

There was a problem with Duplicati, so I’ve installed Duplicati and want te install it again.

But received the following error:

root@raspberrypi:~# apt-get install duplicati

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:

duplicati : Depends: libmono-system-drawing4.0-cil but it is not going to be installed

Depends: libmono-system-servicemodel4.0a-cil but it is not going tobe installed

Depends: libmono-system-servicemodel-discovery4.0-cil but it is notgoing to be installed

Depends: libmono-system-serviceprocess4.0-cil but it is not going to be installed

Depends: libmono-system-web4.0-cil but it is not going to be installed

Depends: libmono-system-web-services4.0-cil but it is not going tobe installed

Depends: gtk-sharp2 but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

I’ve tried the apt-get dist-upgrade.

root@raspberrypi:~# apt-get dist-upgrade

Reading package lists... Done

Building dependency tree

Reading state information... Done

Calculating upgrade... Done

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I’ve tried the

root@raspberrypi:~# apt-get -f install

Reading package lists... Done

Building dependency tree

Reading state information... Done

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I’ve tried the apt-clean in OMV webbrowser.

I’ve tried to install from OMV webbrowser:

Reading package lists...

Building dependency tree...

Reading state information...

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:

>>> *************** Error ***************

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; export DEBIAN_FRONTEND=noninteractive; apt-get --yes --allow-downgrades --allow-change-held-packages --fix-missing --allow-unauthenticated --reinstall install openmediavault-duplicati 2>&1' with exit code '100': Reading package lists...

Building dependency tree...

Reading state information...

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:

openmediavault-duplicati : Depends: duplicati but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

<<< *************************************

>>> *************** Error ***************

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; export DEBIAN_FRONTEND=noninteractive; apt-get --yes --allow-downgrades --allow-change-held-packages --fix-missing --allow-unauthenticated --reinstall install openmediavault-duplicati 2>&1' with exit code '100': Reading package lists...

Building dependency tree...

Reading state information...

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:

openmediavault-duplicati : Depends: duplicati but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

<<< *************************************

>>> *************** Error ***************

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; export DEBIAN_FRONTEND=noninteractive; apt-get --yes --allow-downgrades --allow-change-held-packages --fix-missing --allow-unauthenticated --reinstall install openmediavault-duplicati 2>&1' with exit code '100': Reading package lists...

Building dependency tree...

Reading state information...

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:

openmediavault-duplicati : Depends: duplicati but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

<<< *************************************

>>> *************** Error ***************

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; export DEBIAN_FRONTEND=noninteractive; apt-get --yes --allow-downgrades --allow-change-held-packages --fix-missing --allow-unauthenticated --reinstall install openmediavault-duplicati 2>&1' with exit code '100': Reading package lists...

Building dependency tree...

Reading state information...

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:

openmediavault-duplicati : Depends: duplicati but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

<<< *************************************

What can I do more to make Duplicati working?

Thanks

Duplicati is installed now:
I don't know whith commands are nessecary, but I've done it as follows:

apt-get remove mono-complete mono-devel mono-runtime
apt-get autoremove
apt-get remove --purge libmono*
sudo apt-get purge mono-runtime
sudo apt-get purge mono-complete

Now Check for some mono remaining parts as lib or others things and unistall them

dpkg --get-selections | grep mono
Now unistall them

apt-get remove remainings-parts
Now clean apt cache

apt get clean
apt-get autoclean

New Mono install:
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb http://download.mono-project.com/repo/debian stable-stretch main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt-get update

Check the exact version of Mono.
apt-cache showpkg mono-devel
And install it

aptitude install mono-devel=version
In my case: aptitude install mono-devel=5.8.0.108-0xamarin1+debian9b1

First choice to keep versions, choice is no.
Next choice is Yes and Yes.