/usr/share/plasma/services/activities.operations is in plasma-workspace 4:5.5.5.2-0ubuntu1.
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 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE kcfg SYSTEM
    "http://www.kde.org/standards/kcfg/1.0/kcfg.xsd">
<kcfg>
    <group name="add">
        <entry name="Name" type="String">
            <label>The name to give the new activity.</label>
        </entry>
    </group>
    <group name="setCurrent">
    </group>
    <group name="stop">
    </group>
    <group name="start">
    </group>
    <group name="setName">
        <entry name="Name" type="String">
            <label>The name to give the activity.</label>
        </entry>
    </group>
    <group name="setIcon">
        <entry name="Icon" type="String">
            <label>The name of the icon to give the activity.</label>
        </entry>
    </group>
    <group name="remove">
        <entry name="Id" type="String">
            <label>UID of the activity to remove. (optional)</label>
        </entry>
    </group>
    <group name="setEncrypted">
        <entry name="Encrypted" type="Bool">
            <label>True to encrypt the activity, false to decrypt</label>
        </entry>
    </group>
    <group name="toggleActivityManager">
    </group>
</kcfg>
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