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I want to install macbuntu theme but Err:12 http://ppa.launchpad.net/mc3man/mpv-tests/ubuntu cosmic Release
404 Not Found [IP: 91.189.95.83 80] Err:13 http://ppa.launchpad.net/noobslab/macbuntu/ubuntu cosmic Release 404 Not Found [IP: 91.189.95.83 80] AND E: The repository 'http://ppa.launchpad.net/noobslab/macbuntu/ubuntu cosmic Release' does not have a Release file. What should i do?

  • Welcome to Ask Ubuntu. Did you verify that the PPA supports Cosmic (18.10)? It doesn't; just opening the links from this page or your sources shows there is no 'cosmic' folder. If you don't want to read the PPA's main page and see what the author says, when it was last built etc a browser can be used to look at where your apt commands will go (I only looked up mpv-tests; but suspect it's the same for all) – guiverc Jan 15 at 6:00

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