我试图编辑 source.listapt-get install update并从中生成新的源代码repogen.simplylinux.ch，我不知道在编辑过程中发生了什么，但现在当我输入时，version它说：
WARNING:root:could not open file '/etc/apt/sources.list'
version: command not found
当我这样做时，apt-get install mtools它说：
root@spider-laptop:~# apt-get install mtools
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package mtools is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'mtools' has no installation candidate