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MéthodeFirefox installation .deb

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sudo snap remove --purge firefox
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sudo apt remove firefox
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sudo apt install wget curl gpg software-properties-common apt-transport-https
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sudo mkdir -p /etc/apt/keyrings
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sudo wget -q https://packages.mozilla.org/apt/repo-signing-key.gpg -O /etc/apt/keyrings/packages.mozilla.org.asc
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sudo cat >/etc/apt/sources.list.d/mozilla.list <<EOF
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deb [signed-by=/etc/apt/keyrings/packages.mozilla.org.asc] https://packages.mozilla.org/apt mozilla main
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EOF
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sudo cat >/etc/apt/preferences.d/mozilla-firefox <<EOF
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Package: *
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Pin: origin packages.mozilla.org
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Pin-Priority: 1000
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Package: firefox*
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Pin: release o=Ubuntu
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Pin-Priority: -1
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EOF
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sudo apt update 
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sudo apt install firefox firefox-locale-fr
MéthodeThunderbird installation deb
1
sudo snap remove --purge thunderbird 
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sudo apt remove  thunderbird
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sudo add-apt-repository -y ppa:mozillateam/ppa
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sudo cat >/etc/apt/preferences.d/mozilla-thunderbird <<EOF
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Package: thunderbird*
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Pin: release o=LP-PPA-mozillateam
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Pin-Priority: 1001
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EOF
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sudo apt update 
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sudo apt install thunderbird thunderbird-locale-fr
MéthodeVivaldi
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sudo dpkg -i vivaldi-stable_....deb 
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MéthodeMicrosoft Edge