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when i open appcenter a popup message is appeared as shown in the pic.Anyone knows what the poroblem is?

when i open appcenter a popup message is appeared as shown in the pic.Anyone knows what the poroblem is?]

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Your WINE repository is very old and deprecated (see here) and does not have proper update packages for your OS. To fix this issue, first remove this PPA from your system:

sudo add-apt-repository --remove ppa:ubuntu-wine/ppa

and then add the newer WINE PPA:

wget https://dl.winehq.org/wine-builds/Release.key

sudo apt-key add Release.key

sudo apt-add-repository 'https://dl.winehq.org/wine-builds/ubuntu/'

sudo apt-get update

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when i try to execute enter image description here sudo apt-add-repository 'https://dl.winehq.org/wine-builds/ubuntu/' it shows " 404 Not Found [IP: 91.189.95.83 80] Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/webupd8team/gnome3/ubuntu bionic 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. E: The repository 'http://ppa.launchpad.net/wine/wine-builds/ubuntu bionic 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." And hence i cannot execute apt-get update

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