我似乎无法在 Ubuntu 16.04 LTS 上安装任何软件包

我最初在安装服务器时安装了 LAMP 包。我花了很长时间才让 Web 服务器工作，然后我发现 PHP 没有作为包的一部分安装，这很奇怪，因为它应该是。我还尝试安装 SSH 服务器，以便可以使用 Putty 登录。每当我尝试安装任何东西时，我都会得到以下信息：-

jim@Unseen:~$ sudo apt-get -f install php libapache2-mod-php php-mcrypt php-mysq
l                                                                               
Reading package lists... Done                                                   
Building dependency tree                                                        
Reading state information... Done                                               
libapache2-mod-php is already the newest version (1:7.0+35ubuntu6.1).           
php-mysql is already the newest version (1:7.0+35ubuntu6.1).                    
The following additional packages will be installed:                            
  libmcrypt4 php7.0 php7.0-mcrypt                                               
Suggested packages:                                                             
  libmcrypt-dev mcrypt                                                          
The following NEW packages will be installed                                    
  libmcrypt4 php php-mcrypt php7.0 php7.0-mcrypt                                
0 to upgrade, 5 to newly install, 0 to remove and 0 not to upgrade.             
Need to get 0 B/83.5 kB of archives.                                            
After this operation, 326 kB of additional disk space will be used.             
Do you want to continue? [Y/n] y                                                
E: Waited for /usr/sbin/dpkg-preconfigure --apt || true but it wasn't there     
E: Failure running script /usr/sbin/dpkg-preconfigure --apt || true             

我试过apt-get clean。我试过标准的apt-get。我已经运行了 apt-get update。我尝试的任何方法似乎都不起作用。任何人都可以提出任何建议来帮助我。我是 ubuntu 的新手，对此感到非常沮丧。提前致谢

编辑：

尽管我的服务器是 16.04.4，但我尝试了在引用 14.0* 的类似帖子中建议的修复：-

sudo sh -c "echo 'DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt || true";};' >> /etc/apt/apt.conf.d/70debconf"

这不起作用，并报告 70debconf 不存在。

编辑 2

我按照建议更正了命令字符串：-

sudo sh -c "echo 'DPkg::Pre-Install-Pkgs {\"/usr/sbin/dpkg-preconf
igure --apt || true\";};' >> /etc/apt/apt.conf.d/70debconf"

它返回了一个没有消息的提示，所以我认为它有效

然后我运行以下命令： -

sudo apt-get install openssh-server

并返回与以前完全相同：-

Reading package lists... Done                                                   
Building dependency tree                                                        
Reading state information... Done                                               
The following additional packages will be installed:                            
  ncurses-term openssh-sftp-server python3-requests python3-urllib3             
  ssh-import-id                                                                 
Suggested packages:                                                             
  ssh-askpass rssh molly-guard monkeysphere python3-ndg-httpsclient             
  python3-openssl python3-pyasn1                                                
The following NEW packages will be installed                                    
  ncurses-term openssh-server openssh-sftp-server python3-requests              
  python3-urllib3 ssh-import-id                                                 
0 to upgrade, 6 to newly install, 0 to remove and 0 not to upgrade.             
Need to get 0 B/746 kB of archives.                                             
After this operation, 5,652 kB of additional disk space will be used.           
Do you want to continue? [Y/n] y                                                
Preconfiguring packages ...                                                     
E: Waited for /usr/sbin/dpkg-preconfigure --apt || true but it wasn't there     
E: Failure running script /usr/sbin/dpkg-preconfigure --apt || true  

编辑 3

在一些极好的帮助后，我想到了一个想法。在这些问题开始之前，我安装了 Webmin 作为从桌面远程访问服务器的快捷方式。我尝试通过 webmin 安装 Openssh-server，令我惊讶的是它成功了。所以结论看起来 webmin 以某种方式干扰了服务器上的本机功能。我确信这不应该发生，我想知道我是否应该报告它。