China HS code interpretation guide

List of the contents of this article:

• 1,China HS code interpretation guide< A href='What is the latest system initialization method of #UBuntu?' title='What is the latest system initialization method of UBuntu?' > What is the latest system initialization method of UBuntu?
• 2, ubuntu operating system upgrade
• 3, Briefly describe the steps to update the mirror source in the Ubuntu system?
• 4, How to update the expired version of Ubuntu

What is the latest system initialization method of UBuntu?

1. Update the system: Run the following command in the terminal to update the package list of the Ubuntu system and install available updates.

2. The method of running testsh initialization device in the ubuntu environment is as follows: First, make sure that the Ubuntu operating system has been installed and you have the appropriate permissions to run the script.Secondly, on the Ubuntu desktop, click the "Terminal" icon in the upper left corner. Finally, use the terminal command line to navigate to the directory containing the testsh script.

3. At this time, it is prompted to update. Just cross it out. It's better not to update. Change the keyboard input system to: fcitx. Restart or log out once after setting. This step is very important. 1 After successful installation, you will see the familiar input method icon in the lower right corner.

4. The setting method is: click "System" - "System Management" - "Login Window" (you need to enter the administrator password), and then check (enable automatic login) on the "Security" option page, and then select your username in the drop-down list. After that, Ubuntu can log in automatically.

5. Ubuntu Software Center.According to the query Pacific Technology Network, ubuntulinux provides a configuration file called "source list" to define different software sources. Users can add, delete or modify software sources by editing this configuration file. In ubuntulinux, the system defaults to Ubuntu Software Center.

ubuntu operating system upgrade

1. If other operating systems are installed in the system and the hard disk space has been occupied by the installed operating system, this situation is more troublesome, in addition to adding a new hard Off-disk, disk space can also be allocated to the system in the following ways.

2, because I'm upgrading the kernel here, inIn the Grub boot interface, you can see the old kernel version (15), so you can select the old kernel to start Ubuntu.

3. When an update is available, Ubuntu 104 will display an update notification in the upper right corner of the screen in the form of a floating window. 2 When the update notification appears, click the Ubuntu Software Center icon (orange shopping bag icon) on the launcher bar to start the application window of the Software Center.

4. If you are using other Ubuntu versions, you can upgrade to Ubuntu 104 through the online upgrade function. If you do not use the Ubuntu system, you can only choose to install Ubuntu 104 on the hard disk. Note: The above pictures are uploaded to the Honglian Linux system tutorial channel.

Briefly describe the steps to update the mirror source in the Ubuntu system?

Create a .pip folder under the home directory, and then create a pip.conf file under this directory. The pip.conf file is written as follows (changeMirror source of Tsinghua University): After right-click paste, enter: wq to force save and exit.

Add a new software source The following are the specific steps to add a new software source: open the terminal and log in to the system with root permission.

At this point, the Ubuntu system has been installed, and you can use it. When entering the Ubuntu boot menu, after selecting *Ubuntu with the cursor, press the e key on the keyboard to enter the startup item editing mode.

First of all, the mirror directory is apt-mirror under /var/spool/. Secondly, try to mirror with the official source or the mirror station listed in the Ubuntu system source list.There should be more than 40G of space under /var, and it is recommended to reserve more than 30% of the margin on the basis of 40G.

How to update the expired version of Ubuntu

Upgrade to the next version. To do this, you need to first modify the software source /etc/apt/sources.list to the next version code, and then run the following command. Sudoapt-getupdate. Sudoapt-getupgrade. Sudoapt-getdist-upgrade. Then just restart it.

1: Use the update manager to enter in the terminal: update-mAnager –d Then you can see a version-upgradable update manager, and then click Upgrade. If you can't upgrade, click "Check:" in the update manager first, and then click Upgrade again.

Generally, the overall version will not be updated, but only some of the required software packages will be updated. For example, when upgrading, the system version does not jump from 04 to 10.

Search through the command strings /lib/x86_64-linux-gnu/libc.so.6 | grep GLIBC_, but I really didn't see GCC 27. Reinstalling the system is another very tedious thing. I happened to find that ubuntu supports upgrading now. I tried it and found that the effect was quite good.

Operation steps: When an update is available, Ubuntu 104 will display an update notification in the upper right corner of the screen in the form of a floating window. When the update notification appears, click the Ubuntu Software Center icon (orange shopping bag icon) on the launcher bar to start the application window of the software center.

Ubuntu 110 is now available for download, which is good news for those newly installed Linuxers. Because Ubuntu 104 is a long-term supported version (which means that it is a bug fix and security update support for 5 years), the system will not automatically pop up a window to tell you that a new version is available.