Hi, I'm a pig guy. I had a PC with Ubuntu at home, but I didn't use it at all. We will build the server.
First, we will update. p>
At this point, the firewall could not be installed. p> ``` $apt install ufw $sudo apt install ufw $sudo apt-get install uff ```
If the above does not work, check the firewall status with the following command. p> ``` $sudo ufw status Status:Inactive ```
Is the firewall installed? So p>
Try to enable it. p> ``` $sudo ufw enable The firewall is active and enabled at system startup. ```
Let's check the status. p> ``` $sudo ufw status Status:Active ```
This completes the firewall settings. p>
In this case, open port 22. p>
If successful p> ``` Added rules Added rules(v6) ``` You will see the notation
. p>
3. p>
  If you get the following error  span>  p>
```
E:Lock~
```
    Delete the target file referring to the following  span>  p>
 https://qiita.com/jizo/items/9496496a3156dd39d91a https://ankyo.blog.ss-blog.jp/2011-10-25  This is no good ...  p>
   Possibly there was a problem with the last shutdown,  p>
   Restart Ubuntu.  p>
   This worked  p>
```
Do you want to continue? [Y/n]
$ Y
```
 This completes the Apache installation.
   Let's check if the server is started.  p>
   If the initial Ubuntu page is displayed, it is successful.  p>
   First, check the IP address here  p>
  It's hard to understand, but it is displayed in the following place.  p>
 https://linuxfan.info/ip-address  IP  address  span> in the address bar ...  p>
   You're done here.  p>
   If you leave it as it is, it may be attacked, so stop Apache once.  p>
 It's just for learning purposes.
 (My acquaintance also self-taught and built a server and received some kind of attack. Some security measures may be required)  If it is not displayed, there should be no problem.  p>
         
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               6. Confirmation  h1>
 
$Ip a
 $service apache2 stop