常规更新失败并显示以下消息：
之前的安装尚未完成
安装可能由于相应软件包中的错误而失败，或者以不友好的方式取消。您必须先修复此问题，然后才能安装或删除任何其他软件。
根据我找到的提示，我执行了sudo apt-get update和sudo apt-get upgrade。后者终止于：
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
linux-generic-pae linux-headers-generic-pae linux-image-generic-pae
The following packages will be upgraded:
apport apt-xapian-index aptdaemon ca-certificates firefox firefox-globalmenu
firefox-locale-en libsnmp-base libsnmp15 libsvn1 linux-firmware
linux-libc-dev mime-support openssh-client python-httplib2 python-keyring
ssh-askpass-gnome tzdata ubuntu-system-service unattended-upgrades
20 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
E: The package index files are corrupted. No Filename: field for package tzdata.
我不知道下一步该做什么。
答案1
删除一些文件
sudo rm -r /var/lib/apt/lists/*
sudo apt-get clean
sudo apt-get update
强制安装tzdatavia
sudo apt-get install --reinstall tzdata
在那之后
sudo apt-get dist-upgrade