在 Ubuntu 执行 sudo apt-get install 时，出现了如下的报错：
Setting up ssh (1:7.6p1-4ubuntu0.3) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for ca-certificates (20180409) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Processing triggers for systemd (237-3ubuntu10.33) ...
Processing triggers for initramfs-tools (0.130ubuntu3.9) ...
Processing triggers for dbus (1.12.2-1ubuntu1.1) ...
Errors were encountered while processing:rsyslog
E: Sub-process /usr/bin/dpkg returned an error code (1)
通过执行下面的命令可以解决该问题：
$ sudo mv /var/lib/dpkg/info/ /var/lib/dpkg/info_old/
$ sudo mkdir /var/lib/dpkg/info/
$ sudo apt-get update
$ sudo apt-get -f install
$ sudo mv /var/lib/dpkg/info/* /var/lib/dpkg/info_old/
$ sudo rm -rf /var/lib/dpkg/info
$ sudo mv /var/lib/dpkg/info_old/ /var/lib/dpkg/info/
$ sudo mv /var/lib/dpkg/info/ /var/lib/dpkg/info_old/$ sudo mkdir /var/lib/dpkg/info/$ sudo apt-get update$ sudo apt-get -f install$ sudo mv /var/lib/dpkg/info/* /var/lib/dpkg/info_old/$ sudo rm -rf /var/lib/dpkg/info$ sudo mv /var/lib/dpkg/info_old/ /var/lib/dpkg/info/
输入上述命令之后，在执行 sudo apt-get update 和 sudo apt-get upgrade 就不会有问题了。