Ubuntu不知道什么原因，不能用 apt-get install 安装任何软件了，并且在屏幕上输出海量错误信息，非常迷惑人，例如下面这一例：
insserv: Starting vpnagentd_init depends on plymouth and therefore on system facility `$all' which can not be true!insserv: There is a loop between service vpnagentd_init and mountkernfs if startedinsserv: loop involving service mountkernfs at depth 1insserv: Starting vpnagentd_init depends on plymouth and therefore on system facility `$all' which can not be true!......
insserv: Starting vpnagentd_init depends on plymouth and therefore on system facility `$all' which can not be true!insserv: There is a loop between service vpnagentd_init and dns-clean if startedinsserv: loop involving service dns-clean at depth 1......
insserv: Starting vpnagentd_init depends on plymouth and therefore on system facility `$all' which can not be true!insserv: exiting now without changing boot order!update-rc.d: error: insserv rejected the script headerdpkg: error processing package binfmt-support (--configure):subprocess installed post-installation script returned error exit status 1No apport report written because MaxReports is reached alreadyProcessing triggers for initramfs-tools (0.122ubuntu8.10) ...update-initramfs: Generating /boot/initrd.img-4.13.0-32-genericErrors were encountered while processing:udevgrub-commongrub2-commongrub-pc-bingrub-pcresolvconfbinfmt-supportE: Sub-process /usr/bin/dpkg returned an error code (1)
这里只列出了部分错误信息，实际上输出的内容极多，多得让人眼都瞎。