/usr/share/kservices5/plasma-applet-org.kde.plasma.volume.desktop is in plasma-pa 4:5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | [Desktop Entry]
Name=Audio Volume
Name[ast]=Volume d'audiu
Name[ca]=Volum de l'àudio
Name[ca@valencia]=Volum de l'àudio
Name[cs]=Hlasitost zvuku
Name[da]=Lydstyrke
Name[de]=Lautstärke
Name[el]=Ένταση ήχου
Name[en_GB]=Audio Volume
Name[es]=Volumen del sonido
Name[et]=Helitugevus
Name[fi]=Äänenvoimakkuus
Name[gl]=Volume do son
Name[it]=Volume audio
Name[ko]=오디오 음량
Name[lt]=Garsumas
Name[nl]=Geluidsvolume
Name[nn]=Lydstyrke
Name[pa]=ਆਡੀਓ ਵਾਲੀਅਮ
Name[pl]=Głośność dźwięku
Name[pt]=Volume do Áudio
Name[pt_BR]=Volume do áudio
Name[ru]=Громкость
Name[sk]=Hlasitosť zvuku
Name[sl]=Glasnost zvoka
Name[sr]=Јачина звука
Name[sr@ijekavian]=Јачина звука
Name[sr@ijekavianlatin]=Jačina zvuka
Name[sr@latin]=Jačina zvuka
Name[sv]=Ljudvolym
Name[uk]=Гучність
Name[x-test]=xxAudio Volumexx
Name[zh_CN]=音频音量
Name[zh_TW]=音效音量
Comment=
Icon=org.kde.plasma.volume
Type=Service
X-KDE-ServiceTypes=Plasma/Applet,Plasma/PopupApplet
X-Plasma-API=declarativeappletscript
X-Plasma-MainScript=ui/main.qml
X-Plasma-NotificationArea=true
X-Plasma-ConfigPlugins=kcm_pulseaudio
X-KDE-PluginInfo-Name=org.kde.plasma.volume
X-KDE-PluginInfo-Category=Multimedia
X-KDE-PluginInfo-Author=Harald Sitter
X-KDE-PluginInfo-Email=sitter@kde.org
X-KDE-PluginInfo-Version=1.0.0
X-KDE-PluginInfo-Website=
X-KDE-PluginInfo-License=GPL
X-KDE-PluginInfo-EnabledByDefault=true
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