I set up a new ubuntu 17.10 and installed dolphin from Ubuntu software. When I do a search ('find'), after typing a few characters a message shows up 'invalid protocol'. Any packages missing to be installed?

  • 1
    I had this problem with KDE on 16.04. Dolphin needs the Baloo indexing package in order to do searches. Indexing can be turned off, but the package needs to be installed.
    – ravery
    Commented Nov 9, 2017 at 13:46
  • Baloo is installed. Must be some other reason.
    – Hein Bloed
    Commented Nov 10, 2017 at 15:09
  • I started Dolphin in terminal. Then performed a search which resulted in 'invalid protocol'. Here is the output of the terminal: Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/128/" Trying to convert empty KLocalizedString to QString. qt.accessibility.core: Cannot create accessible child interface for object: PlacesView(0x5587b72b7330) index: 23 kf5.kio.core: couldn't create slave: "klauncher said: Unknown protocol 'filenamesearch'.\n"
    – Hein Bloed
    Commented Nov 10, 2017 at 16:45

1 Answer 1


You could try the instructions here: https://www.ryananddebi.com/2015/07/13/linux-getting-find-working-in-dolphin-on-kde-linux-mint-and-kubuntu/

In short install kde-baseapps, systemsettings and kfind. And DISABLE "Enable Desktop Search" in Systemsettings -> Desktop Search. It should work then. It did for me. Pretty counterintuitive but it works ;).

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