1.

sudo cp /etc/apt/sources.list /etc/apt/sources.list.back

sudo gedit /etc/apt/sources.list

2.

清华源deb http://mirrors.tuna./ubuntu/ focal main restricteddeb http://mirrors.tuna./ubuntu/ focal-updates main restricteddeb http://mirrors.tuna./ubuntu/ focal universedeb http://mirrors.tuna./ubuntu/ focal-updates universedeb http://mirrors.tuna./ubuntu/ focal multiversedeb http://mirrors.tuna./ubuntu/ focal-updates multiversedeb http://mirrors.tuna./ubuntu/ focal-backports main restricted universe multiversedeb http://mirrors.tuna./ubuntu/ focal-security main restricteddeb http://mirrors.tuna./ubuntu/ focal-security universedeb http://mirrors.tuna./ubuntu/ focal-security multiverse阿里源deb /ubuntu/ focal main restricted universe multiversedeb-src /ubuntu/ focal main restricted universe multiversedeb /ubuntu/ focal-security main restricted universe multiversedeb-src /ubuntu/ focal-security main restricted universe multiversedeb /ubuntu/ focal-updates main restricted universe multiversedeb-src /ubuntu/ focal-updates main restricted universe multiversedeb /ubuntu/ focal-proposed main restricted universe multiversedeb-src /ubuntu/ focal-proposed main restricted universe multiversedeb /ubuntu/ focal-backports main restricted universe multiversedeb-src /ubuntu/ focal-backports main restricted universe multiverse中科源deb https://mirrors./ubuntu/ focal main restricted universe multiversedeb-src https://mirrors./ubuntu/ focal main restricted universe multiversedeb https://mirrors./ubuntu/ focal-updates main restricted universe multiversedeb-src https://mirrors./ubuntu/ focal-updates main restricted universe multiversedeb https://mirrors./ubuntu/ focal-backports main restricted universe multiversedeb-src https://mirrors./ubuntu/ focal-backports main restricted universe multiversedeb https://mirrors./ubuntu/ focal-security main restricted universe multiversedeb-src https://mirrors./ubuntu/ focal-security main restricted universe multiversedeb https://mirrors./ubuntu/ focal-proposed main restricted universe multiversedeb-src https://mirrors./ubuntu/ focal-proposed main restricted universe multiverse网易源deb /ubuntu/ focal main restricted universe multiversedeb /ubuntu/ focal-security main restricted universe multiversedeb /ubuntu/ focal-updates main restricted universe multiversedeb /ubuntu/ focal-proposed main restricted universe multiversedeb /ubuntu/ focal-backports main restricted universe multiversedeb-src /ubuntu/ focal main restricted universe multiversedeb-src /ubuntu/ focal-security main restricted universe multiversedeb-src /ubuntu/ focal-updates main restricted universe multiversedeb-src /ubuntu/ focal-proposed main restricted universe multiversedeb-src /ubuntu/ focal-backports main restricted universe multiverse

3.

sudo apt-get update

sudo apt-get upgrade

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