Via apt-file search
/usr/bin/plasmashell
Portanto, instale apt-file
via
sudo apt-get install apt-file
Agora pesquise os pacotes dos arquivos via
apt-file search --regex /usr/bin/plasmashell$
apt-file search --regex /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5$
apt-file search --regex /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5$
apt-file search --regex /usr/lib/x86_64-linux-gnu/libQt5Core.so.5$
A saída é
plasma-workspace: /usr/bin/plasmashell
libqt5quick5: /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
libqt5quick5-gles: /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
libqt5widgets5: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
libqt5widgets5: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.4
libqt5widgets5: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.4.1
libqt5core5a: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
e, portanto, eu usaria
sudo apt-get install plasma-workspace-dbg