Ubuntu 16.04更新核心到20.04（無損）轉載

轉載來源：https://www.jianshu.com/p/f399665b16a7

自己保留個記錄

google了很多文章以後，總結了一個有用的，測試成功：

首先需要從16.04 → 18.04

sudo mv /etc/apt/sources.list ~/

sudo mv /etc/apt/sources.list.d/*.list ~/

改變源（粘貼下面這一段到終端并運作）

cat <<EOF | sudo tee /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu/ xenial-backports main universe multiverse restricted

deb http://archive.ubuntu.com/ubuntu/ xenial main universe multiverse restricted

deb http://archive.ubuntu.com/ubuntu/ xenial-updates main universe multiverse restricted

deb http://security.ubuntu.com/ubuntu/ xenial-security main universe multiverse restricted

EOF

依次執行以下語句

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ xenial-backports main universe multiverse restricted"

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ xenial main universe multiverse restricted"

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ xenial-updates main universe multiverse restricted"

sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu/ xenial-security main universe multiverse restricted"

執行更新

sudo apt-get update

sudo apt-get upgrade

sudo apt-get purge ubuntu-advantage-tools --autoremove

sudo rm /etc/apt/sources.list.d/ubuntu-esm-infra.list

sudo do-release-upgrade

更新過程比較漫長，大約半個小時，完畢後提示是否要重新開機，重新開機就行

過程中彈出的視窗，統統回車就行（一般是問你保留舊設定還是覆寫，回車預設保留）——————實際驗證很多要選擇y才能繼續

18.04 → 20.04

基本一樣的步驟,但是必須要先更新到18.04：

sudo mv /etc/apt/sources.list ~/

sudo mv /etc/apt/sources.list.d/*.list ~/

改變源（粘貼下面這一段到終端并運作）

cat <<EOF | sudo tee /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu/ bionic-backports main universe multiverse restricted

deb http://archive.ubuntu.com/ubuntu/ bionic main universe multiverse restricted

deb http://archive.ubuntu.com/ubuntu/ bionic-updates main universe multiverse restricted

deb http://security.ubuntu.com/ubuntu/ bionic-security main universe multiverse restricted

EOF

依次執行以下語句

執行更新