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So I've been getting this error: E: The repository 'http://ppa.launchpad.net/f-muriana/ubuntu-builder/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

Can someone please help? Oh, I'm on ubuntu 20.04

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  • The PPA in the error message hasn't been updated since 2014 therefore it couldn't possibly support Ubuntu 20.04. Simply remove it. You can use Software & Updates > Other software .
    – ChanganAuto
    May 1, 2022 at 23:36

1 Answer 1

Reset to default
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sudo nano /etc/apt/sources.list

Find this line.

deb http://ppa.launchpad.net/f-muriana/ubuntu-builder/ubuntu focal Release

Comment it (change that line with this line)

# deb http://ppa.launchpad.net/f-muriana/ubuntu-builder/ubuntu focal Release

save the file by pressing ctrl+O press enter. exit with ctrl+x

now run

sudo apt-get update
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  • 1
    Most likely this line is not in the /etc/apt/sources.list
    – Pilot6
    May 1, 2022 at 17:43

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