Reading package lists...
Building dependency tree...
Reading state information...
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
linux-headers-generic : Depends: linux-headers-4.15.0-169-generic but it is not going to be installed
linux-image-generic : Depends: linux-image-4.15.0-169-generic but it is not going to be installed
Depends: linux-modules-extra-4.15.0-169-generic but it is not going to be installed
Recommends: thermald but it is not going to be installed
ubuntu-advantage-tools : Depends: distro-info (>= 0.18ubuntu0.18.04.1) but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
.. install failed!
当我运行apt --fix-broken install：
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
Reading package lists...
Building dependency tree...
Reading state information...
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
apt-show-versions libapt-pkg-perl linux-headers-4.15.0-117
linux-headers-4.15.0-117-generic linux-headers-4.15.0-123
linux-headers-4.15.0-123-generic linux-headers-4.15.0-128
linux-headers-4.15.0-128-generic linux-headers-4.15.0-136
linux-headers-4.15.0-136-generic linux-headers-4.15.0-142
linux-headers-4.15.0-142-generic linux-headers-4.15.0-143
linux-headers-4.15.0-143-generic linux-headers-4.15.0-144
linux-headers-4.15.0-144-generic linux-headers-4.15.0-154
linux-headers-4.15.0-154-generic linux-headers-4.15.0-45
linux-headers-4.15.0-45-generic linux-headers-4.15.0-50
linux-headers-4.15.0-50-generic linux-headers-4.15.0-65
linux-headers-4.15.0-65-generic linux-headers-4.15.0-74
linux-headers-4.15.0-74-generic linux-headers-4.15.0-99
linux-headers-4.15.0-99-generic linux-image-4.15.0-117-generic
linux-image-4.15.0-123-generic linux-image-4.15.0-128-generic
linux-image-4.15.0-136-generic linux-image-4.15.0-142-generic
linux-image-4.15.0-143-generic linux-image-4.15.0-144-generic
linux-image-4.15.0-154-generic linux-image-4.15.0-45-generic
linux-image-4.15.0-50-generic linux-image-4.15.0-65-generic
linux-image-4.15.0-74-generic linux-image-4.15.0-99-generic
linux-modules-4.15.0-117-generic linux-modules-4.15.0-123-generic
linux-modules-4.15.0-128-generic linux-modules-4.15.0-136-generic
linux-modules-4.15.0-142-generic linux-modules-4.15.0-143-generic
linux-modules-4.15.0-144-generic linux-modules-4.15.0-154-generic
linux-modules-4.15.0-45-generic linux-modules-4.15.0-50-generic
linux-modules-4.15.0-65-generic linux-modules-4.15.0-74-generic
linux-modules-4.15.0-99-generic linux-modules-extra-4.15.0-117-generic
linux-modules-extra-4.15.0-123-generic
linux-modules-extra-4.15.0-128-generic
linux-modules-extra-4.15.0-136-generic
linux-modules-extra-4.15.0-142-generic
linux-modules-extra-4.15.0-143-generic
linux-modules-extra-4.15.0-144-generic
linux-modules-extra-4.15.0-154-generic linux-modules-extra-4.15.0-45-generic
linux-modules-extra-4.15.0-50-generic linux-modules-extra-4.15.0-65-generic
linux-modules-extra-4.15.0-74-generic linux-modules-extra-4.15.0-99-generic
php python-pyicu
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
libnss-systemd libpam-systemd systemd
Suggested packages:
systemd-container
The following packages will be upgraded:
libnss-systemd libpam-systemd systemd
3 upgraded, 0 newly installed, 0 to remove and 80 not upgraded.
Need to get 3128 kB of archives.
根据回复（感谢您的回复）：
按照上面的方法（第一个）操作，得到如下结果：
sudo apt update && sudo apt full-upgrade
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
Hit:1 http://mirrors.linode.com/ubuntu bionic InRelease
Hit:2 http://mirrors.linode.com/ubuntu bionic-updates InRelease
Hit:3 http://mirrors.linode.com/ubuntu bionic-backports InRelease
Hit:4 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease
Hit:5 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:6 http://software.virtualmin.com/vm/6/gpl/apt virtualmin-bionic InRelease
Hit:7 http://software.virtualmin.com/vm/6/gpl/apt virtualmin-universal InRelease
Hit:8 http://archive.ubuntu.com/ubuntu bionic InRelease
Reading package lists...
Building dependency tree...
Reading state information...
83 packages can be upgraded. Run 'apt list --upgradable' to see them.
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
Reading package lists...
Building dependency tree...
Reading state information...
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
systemd : Depends: libsystemd0 (= 237-3ubuntu10.52) but 237-3ubuntu10.53 is installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).