I have a situation about installing Super Boot Manager on Ubuntu 16.04 LTS. I have try installation with adding official repo / ppa:ingalex/super-boot-manager / and then update and install with sudo apt-get install super-boot-manager , but error message:

  • W: The repository > 'http://ppa.launchpad.net/ingalex/super-boot-manager/ubuntu xenial > Release' does not have a Release file. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. > N: See apt-secure(8) manpage for repository creation and user configuration details.

also I try different type of installation but all the same. BUC is installed, but no deference. EDIT: After trying to update again next message appear :

Failed to fetch http://ppa.launchpad.net/ingalex/super-boot-manager/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found

This and top one appears together.

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