运行 Ubuntu 16.04。所有其他软件包更新正常，但尝试更新或删除 ruby-net-telnet 会返回错误
Preparing to unpack .../ruby-net-telnet_0.1.1-2_all.deb ...
Unpacking ruby-net-telnet (0.1.1-2) over (0.1.1-2) ...
dpkg: error processing archive /var/cache/apt/archives/ruby-net-telnet_0.1.1-2_all.deb (--unpack):
unable to install (supposed) new info file '/var/lib/dpkg/tmp.ci/md5sums': Is a directory
Selecting previously unselected package libruby2.5:amd64.
Preparing to unpack .../libruby2.5_2.5.1-1bbox1~xenial4_amd64.deb ...
Unpacking libruby2.5:amd64 (2.5.1-1bbox1~xenial4) ...
Selecting previously unselected package ruby2.5.
Preparing to unpack .../ruby2.5_2.5.1-1bbox1~xenial4_amd64.deb ...
Unpacking ruby2.5 (2.5.1-1bbox1~xenial4) ...
Processing triggers for libc-bin (2.23-0ubuntu10) ...
Processing triggers for man-db (2.7.5-1) ...
Errors were encountered while processing:
/var/cache/apt/archives/ruby-net-telnet_0.1.1-2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
我尝试过不同论坛提供的多种解决方案，包括：
sudo apt-get update
sudo apt-get clean
sudo apt-get autoremove
sudo apt-get update && sudo apt-get upgrade
sudo dpkg --configure -a
sudo apt-get install -f
从这个帖子这正好符合我的问题
我尝试创建/var/lib/dpkg/tmp.ci/目录和一个空的 md5sums 文件，但没有效果。
ruby-net-telnet 项目页面显示最新更新如下：
2016-03-01 - Christian Hofstaedtler ruby-net-telnet (0.1.1-2) 不稳定；紧急程度=中等
- 团队上传。
- 设置 Multi-Arch: foreign 以允许 ruby 本身的交叉安装
- 将标准版本更新至 3.9.7（无其他更改）
任何想法都值得赞赏。