Dolphin 20.08.1 / Preferences / Services / Download new services, you can see Add-On installer. Click install button, it says “Failed to execute install script”. When i try again it says:
This file already exists on disk (possibly due to an earlier failed download attempt). Continuing means overwriting it. Do you wish to overwrite the existing file?
sudo grep -Ri “dolphin” /var/log
shows nothing related