debファイルをインストールできない（GUIおよびターミナルも使用）（Ubuntu 18.04）
問題なくYouTube To MP3で動作するUbuntu 18.04にUbuntu 16.04アプリケーションをインストールしようとしています。
debファイルをダブルクリックすると、GUIインストーラーが実行されますが、installをクリックすると、インストールが開始され、停止してエラーは表示されませんが、installボタンはまだあります。 
手動でインストールしようとしましたが、エラーもあります。ここに私の手順を示します。
milano@milano-PC:~/Downloads$ Sudo dpkg -i youtube-to-mp3-converter3-9-4-64-bit.deb
[Sudo] password for milano:
Selecting previously unselected package youtube-to-mp3.
(Reading database ... 179031 files and directories currently installed.)
Preparing to unpack youtube-to-mp3-converter3-9-4-64-bit.deb ...
Unpacking youtube-to-mp3 (3.8.4) ...
dpkg: dependency problems prevent configuration of youtube-to-mp3:
youtube-to-mp3 depends on libqt4-declarative (>= 4:4.8.1-0ubuntu4.6); however:
Package libqt4-declarative is not installed.
youtube-to-mp3 depends on libav-tools; however:
Package libav-tools is not installed.
dpkg: error processing package youtube-to-mp3 (--install):
dependency problems - leaving unconfigured
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1.1) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Errors were encountered while processing:
youtube-to-mp3
したがって、問題は依存関係がインストールされていないことです：
milano@milano-PC:~/Downloads$ Sudo apt-get install libqt4-declarative
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
libqt4-declarative : Depends: libqt4-network (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqt4-script (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqt4-sql (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqt4-xmlpatterns (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqtcore4 (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqtgui4 (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
youtube-to-mp3 : Depends: libav-tools but it is not installable
Recommends: libav-tools-links but it is not installable
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
私もです：
milano@milano-PC:~/Downloads$ Sudo apt --fix-broken install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages will be REMOVED:
youtube-to-mp3
0 upgraded, 0 newly installed, 1 to remove and 54 not upgraded.
1 not fully installed or removed.
After this operation, 1 434 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 179077 files and directories currently installed.)
Removing youtube-to-mp3 (3.8.4) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.1) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1.1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
編集：
依存関係を再度インストールしてみてください。
milano@milano-PC:~/Downloads$ Sudo apt-get install libqt4-declarative
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
libqt4-declarative : Depends: libqt4-network (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqt4-script (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqt4-sql (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqt4-xmlpatterns (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqtcore4 (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
Depends: libqtgui4 (= 4:4.8.7+dfsg-7ubuntu1) but it is not going to be installed
youtube-to-mp3 : Depends: libav-tools but it is not installable
Recommends: libav-tools-links but it is not installable
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
その後、アプリを再度インストールしようとすると、最初のステップが再び発生します。
milano@milano-PC:~/Downloads$ Sudo dpkg -i youtube-to-mp3-converter3-9-4-64-bit.deb
Selecting previously unselected package youtube-to-mp3.
(Reading database ... 179031 files and directories currently installed.)
Preparing to unpack youtube-to-mp3-converter3-9-4-64-bit.deb ...
Unpacking youtube-to-mp3 (3.8.4) ...
dpkg: dependency problems prevent configuration of youtube-to-mp3:
youtube-to-mp3 depends on libqt4-declarative (>= 4:4.8.1-0ubuntu4.6); however:
Package libqt4-declarative is not installed.
youtube-to-mp3 depends on libav-tools; however:
Package libav-tools is not installed.
dpkg: error processing package youtube-to-mp3 (--install):
dependency problems - leaving unconfigured
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1.1) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Errors were encountered while processing:
youtube-to-mp3
何をすべきか知っていますか？
編集
milano@milano-PC:~/Downloads$ Sudo apt install libav-tools
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libav-tools 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:
ffmpeg:i386 ffmpeg
E: Package 'libav-tools' has no installation candidate
リンクされたサイトからdebファイルをテストしました-バージョン3.9.4（64ビット）で、04.05.16の日付です。したがって、Ubuntu 16.04 LTS（18.04 LTSではない）で動作することが期待されていました。
開発者の（MediaHuman）リポジトリ から新しいバージョン3.9.9.5を取得できます。
Sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7D19F1F3
Sudo add-apt-repository https://www.mediahuman.com/packages/ubuntu
Sudo apt-get update
Sudo apt-get install youtube-to-mp3
その後、それを使用できます。
