Debian package not recognizing that it is already installed.

[Hultan]

Hopefully someone on this forum knows little bit about debian packages. I have created my first *.deb package and it installs and executes correctly, but there are some minor issues:

1. The icon in the software manager (under installed programs) is the generic one, and not the one specified in the desktop-file. The application is correct in the start menu,

2. When I double click on *.deb-file created by another company, in this case, Mullvad VPN, I get a message that says that the same version is already installed and I get the option to reinstall it, When I double click on my *.deb file I don't get that message and I get the option to install the application, even though it is already installed. I would like it to recognize that it is already installed.

Does anyone know what is required in a debian package to make these things work correctly?

Description of the package

I have created the preinstall, postinstall, prerm, postrm files, they do contain only one line though:

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 #!/bin/bash

I added these empty four files because I thought that maybe prerm and postrm triggered the upgrade/reinstall functionality.

My control file looks like this:

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Section: video
Package: softTube
License: MIT
Vendor: SoftTeam AB
Version: 2.6.9
Architecture: amd64
Essential: no
Priority: optional
Depends: smplayer
Installed-Size: 11 258
Maintainer: Per Hultqvist
Description: A YouTube client created by SoftTeam AB

In addition, I of course have my executable in [ROOT]/usr/bin/. The structure:

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[ROOT]
 |- DEBIAN
 |  |-control
 |  |-preinstall    (executable)
 |  |-postinstall   (executable)
 |  |-prerm         (executable)
 |  |-postrm        (executable)
 |
 |- usr
      |- bin
      |    |- softtube
      |
      |- share
            |-applications
            |     |- softtube.desktop
            |- icons
                  |- softtube.png

The desktop file :

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[Desktop Entry]
Version=1.0
Name=SoftTube
GenericName=SoftTube
Exec=//usr/bin/softtube
Terminal=false
Type=Application
Categories=Video;AudioVideo;
Icon=/usr/share/icons/softtube.png
StartupWMClass=SoftTube
Comment=A YouTube client created by SoftTeam AB.
Keywords=softtube;youtube;video;internet;media;