How to solve other login problems when Ubuntu enables root users and proxies to access the Internet

After Ubuntu is installed, the root user is locked by default and cannot log on or "Su" to the root user. Some people say this is a bad practice, especially for servers. I think this is more secure for desktop users. But for servers, you can set it to "allow Su to root, but not allow root users to log on directly ". For the convenience of development, I use this method on both the desktop and server.

◆ Allow Su to root

It is very simple. The following is the setting method:

Me @ tipfoo :~ $ Sudo passwd

Password: <--- enter the password of the user during installation

Enter new Unix Password: <--- New Root User Password

Retype new Unix Password: <--- repeat the New Root User Password

Passwd: the password is successfully updated.

◆Allow Root Login

If you want to allow root logon (not recommended), perform the following operations:

Me @ tipfoo :~ $ Gksu/usr/sbin/gdmsetup

(Or use the desktop menu: system> System Management> logon window)

Click the "Security" option page and select "Allow Local Administrator Logon ".

Note: This step depends on the previous step.

◆ Directly log on without entering the password

Someone complained on the forum that Ubuntu in the House could not be logged on like window $ -- without a password. In fact, the same can be done:

On the "Security" option page in the previous step, select:

"Enable Automatic Logon" and "user" (for example, "me ");

Note: Do not set this for public computers!

◆ Log on to the remote server through SSH

If the remote server only allows the root user to SSH to the server, you must "Su to root" in Ubuntu to log on successfully (depending on the server configuration ).

First, copy the key to the "/root/. Ssh/" directory,

Me @ tipfoo :~ $ Su

Password:

Root @ tipfoo:/home/me # chmod 600-r/root/. Ssh/

Root @ tipfoo:/home/me # ssh-P 27482 11.22.33.44

Enter passphrase for key'/root/. Ssh/id_rsa ':

Last login: Thu Jun 21 14:29:00 2007 from 11.22.33.45

 

 

Proxy surfing Problems

Now the company needs proxy to access the Internet, Ubuntu is so lazy. A few days ago, when ubuntu was installed in the company, it began to check information and set up proxy to access the Internet. The following is a combination of the following, some of which refer to other users, this is not explained here.

1. Firefox proxy for Internet access

Click Edit> preferences> advanced> network> Settings to enter the IP address of the proxy server.

2. synapitc Package Manager was created

This is the most commonly used method for installing software in Ubuntu. If he cannot use it, it will take a long time to install the software. However, it is easy to set it up, just set it in settings-> preferences, similar to the root Firefox.

3. Other proxy settings

1. temporarily use apt-Get through HTTP Proxy

Before using apt-Get, enter the following command in the terminal (replace yourproxyaddress and proxyport according to your actual situation ).
Export http_proxy = http: // yourproxyaddress: proxyport
If the password proxy export http_proxy = http: // username: password @ yourproxyaddress: proxyport
Cancel proxy use
Export http_proxy = ""

2. Set apt-get to permanently use HTTP Proxy

Sudo gedit/etc/APT/apt. conf Add the following line to your apt. conf file (replace yourproxyaddress and proxyport according to your actual situation ).
Acquire: http: proxy "http: // yourproxyaddress: proxyport ";
Save the apt. conf file. (for some reason, I cannot use this method. You must use the following method)

3. Set Global Proxy for Internet access (APT-Get, wget, etc)

Gedit ~ /. Bashrc Add the following content at the end of your. bashrc file (replace according to your actual situation)

Yourproxyaddress and proxyport ).
Export http_proxy = "http: // yourproxyaddress: proxyport"
Save the file and restart the terminal.

After the above settings, you can enjoy your Ubuntu network ....