Ubuntu running level and local ISO software source

This article takes the Ubuntu-12.04.1 server version as an example, ISO version: ubuntu-12.04.1-server-i386.iso1. the default running level of the running level server version is 2, but there is no inittab file in the/etc directory. We can create one manually, and Ubuntu also recognizes this file. Vim/etc/inittabid: 3: initdefault: restart to enter Level 3 2

This article takes the Ubuntu-12.04.1 server version as an example, ISO version: ubuntu-12.04.1-server-i386.iso
 
1. Run level
 
The default running level of the server version is 2, but there is no inittab file in the/etc directory. We can create one manually. Ubuntu also recognizes this file.

Vim/etc/inittab
Id: 3: initdefault:

Restart to enter 3 levels

2. Local ISO software source

The Ubuntu software source file is/etc/apt/sources. list. We can back up the file and directly execute the mv command, so that there is no sources. list file. The following is an ISO image mounted. Generally, if a DVD is attached, it will be automatically mounted. You can also manually mount it to/media/cdcrom.

Mount/dev/cdrom/media/cdrom

Add software source:

Apt-cdrom-m-d =/media/cdrom add

We can view the following information:

Now the file is automatically generated and added after we add the local source.

Run now

Apt-get update

Then you can use apt-get install to install the software.

Apt-get install openssh-server

Summary:

The reason for this is that sometimes the network environment of the data center or our local or virtual machine is limited, we can use the local ISO software source to solve many problems.