Http://ppa.launchpad.net/timsc/opencv-3.3/ubuntu bionic Release' does not have a Release file

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Index of /timsc/opencv-3.3/ubuntu bionic Release’ does not have a Release file
If you want to use this URL to install, how to modify the script

http://ppa.launchpad.net/timsc/opencv-3.4/ubuntu/pool/main/o/opencv/

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please contact the maintainer of the ubuntu package.