我犯了一个可怕的错误并升级到 18.04，而没有通过执行以下操作在不同的分区中进行备份：
sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo apt-get autoremove
sudo apt install update-manager-core
sudo do-release-upgrade -d
然后我在重启后做了更新和升级命令。现在存在许多sudo apt-get -f install命令无法修复的未满足的依赖项和损坏的包问题。更新 sudo apt install -f 错误日志输出的第一部分是：
Reading package lists...
Building dependency tree...
Reading state information...
Correcting dependencies... failed.
The following packages have unmet dependencies:
gnome-calendar : Depends: gsettings-desktop-schemas (>= 3.21.2) but 3.18.1-1ubuntu1 is installed
gnome-session : Depends: gnome-shell (>= 3.25.91-0ubuntu4~) but it is not installed
Depends: gnome-session-bin (>= 3.28.1-0ubuntu2) but 3.18.1.2-1ubuntu1.16.04.2 is installed …