Solution to common problems in UbuntuLinux System

Article Title: solutions to common problems in the UbuntuLinux system. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

I. System Problems

1. The system cannot be started.

The possible problem is that MBR is damaged or GRUB is incorrect. Two solutions can be considered: 1. Enter the rescue mode and edit menu. lst under/boot/grub. 2. Repair MBR. backup MBR: dd if =/dev/had of = MBR-backup bs = 512 count = 1. Recover MBR: dd if = MBR-backup of =/dev/had bs = 512 count = 1.

2. When the ubuntu logo is started

The solution is to edit/boot/grub/menu. lst, find this line: kernel/boot/vmlinz-2.6.15-10 root =/dev/hda1 ro quiet splash, delete splash, after restart will not appear logo.

3. You cannot log on to the graphic interface at startup.

This situation is mostly due to incorrect X-server configuration and requires reconfiguration. Configuration File:/etc/X11/xorg. conf. Run the X configuration process: sudo dpkg-reconfigure xserver-xorg

4. How to add a font

Press the Alt + F2 key (similar to 'win + R' in MS Windows). In the 'run application' dialog box, enter fonts: //. Then, the font folder is displayed, drag the font to be added to this folder. Note that the added font is only valid for the current user.

5. How to test whether the ISO file is complete

Command line: md5sum file_name

Compare the generated 32-bit characters with the 32-bit verification code attached to the file.

6. How to view hidden files in a folder

Click "View" (View) "Show Hidden Files" in the File Browser. The Hidden Files are displayed. You can also use the shortcut key "Ctrl + H ".

7. How to Deal with the graphic desktop stop response

Two solutions: 1. press Alt + Ctrl + Backspace at the same time and then restart x-Windows. 2. press Alt + F2 to jump to the terminal. After logging in, run sudo/etc/init. d/gestation stop, will close x-window and enter test-mode. then type sudo/etc/init. d/TPD start, X-window will be restarted.

8. How to release disk space

First, clear the content in the Trash bin. Right-click and right-click Trash in the bottom right corner of the desktop.

Second, clean up the package cache. Whenever the package is downloaded by Synaptic or the automatic upgrade manager, the package will be saved under/var/cache/apt/archives. Run the following command to clear these packages without affecting the system. Sudo apt-get clean

9. After Windows is installed, Ubuntu cannot be started.

The reason is that Windows overwrites MBR, and the system cannot read the startup information about Ubuntu from it. The solution is to start the system from CD and enter Rescue mode. Press enter to select the keyboard layout and language, and then you will get a list of Hard Disk Partitions. Select the partitions installed with Ubuntu and press Enter. Enter "grub-install/dev/hda" at the shell prompt to install GRUB on the hard disk. Wait until the process ends and "install finished" is output. Then enter "exit" to restart the computer.

10. Forget the system password

Restart the computer. When you see GRUB

2. Application Software

1. Unable to close the program window

Disable using xkill. Press Alt + F2, enter xkill, and press Enter. The mouse changes to the shape of a small segment, and click the window to close.

2. jitters and jumps on the playback DVD Screen

Most of the reasons are that the DMA mode of the DVD server is not started.

Sudo hdparm/dev/sdc grep dma

If the DMA is not started, using_dma = 0 (off) is displayed)

To enable the DMA mode, run sudo hdparm? D 1/dev/sdc

In this case, replay the DVD. If the problem persists, modify/etc/hdparm. conf and add the following code block:

/dev/hdc { 　　dma = on 　　}